...My whole point is that the is/ought divide doesn’t seem to do anything to threaten moral realism.
The is/ought divide threatens the central thesis that Moral Realism attempts to put forward and defend. Moral Realism takes the view that moral values are not simply held by an observing moral agent whom assesses an act in terms of right and wrong, but rather that moral values represent an intrinsic characteristic of an act itself. That an act is either right or wrong in-itself; or, alternatively, that an act possess certain moral properties that a moral agent can intuitively recognize as right or wrong. Either view represents a moral reality that can be objectively considered whether or not the agent is consciously aware of it.
Moral Realism assumes that moral values exist as the constituents of an ontological reality and not as the constituents of a moral agents phenomenological reality.
The central thesis of Moral Realism is committed to four propositions:
1. Moral statements express propositions.
2. Some of these propositions are true.
3. True propositions are made true by objective, mind-independent features of the world.
(A brief digression). Moral Realism diverges into two separate moral doctrines (Naturalism and Non-naturalism) with one (Naturalism) committed to a fourth proposition and the other (Non-naturalism) committed to the negation of the same proposition. I have therefore included both the thesis and antithesis that represent the divergence between these moral doctrines.
4. (Naturalism): These moral features of the world are reducible to some set of non-moral features.
4. (Non-naturalism): These moral features of the world are not reducible to any set of non-moral features.
The first problem that Moral Realism faces is how it can justify the third proposition. Namely, how can moral statements be made true by objective, mind-independent features of the world? Keep in mind that such a problem is raised by attempting to cross the is-ought divide. Moral Realism attempts to cross the divide by claiming that both descriptive and prescriptive statements are true/false propositions and that some are made true by objective, mind-independent features of the world.
According to Moral Realism, it is either the case that objects and events in the world have an intrinsic moral value in themselves (they are either good or bad); or, alternatively, that they possess some moral property of which moral agents innately recognize as being either good or bad. Either way, Moral Realism has committed itself to an ontological central thesis that.
The Non-naturalist is committed to the ontological claim that moral statements correspond with reality insofar as reality contains innate moral properties (such as, an innate human purpose). The Naturalist, on the other hand, is committed to the ontological claim that moral statements can be reduced to a naturally equivalent fact (such as, sensory pleasure (a natural fact) is good (a moral statement).
To flesh out this objection, lets consider the following argument as it attempts to cross the is-ought divide under the interpretation of Moral Realism.
P1. Humans die if you decapitate them (This is a descriptive statement).
P2. John is human. (Another descriptive statement).
C. Therefore, you ought not decapitate John. (This is a prescriptive statement).
It is the case that humans die upon decapitation and it likewise is the case that John is a human. These are both empirically verifiable facts that can be objectively considered. However, nothing about these observations tells us if we ought, or ought not kill humans by virtue of decapitation. This means that the argument is not valid because the premises do not entail the conclusion.
Here, Moral Realists and myself would agree that an additional premise is required in order to make this argument valid. A premise such as "Killing humans is immoral" would suffice, however, here a Moral Realist would be satisfied with her view that such a premise represents an objective fact of the world (an "is" statement), whereas I would remain skeptical and request an argument be provided so that I may see where such an inference is made.
Two arguments would be provided. First, the argument of Semantic Moral Realism that is concerned with our moral utterances and the truth value of the content therein. Semantic Moral Realism states that though moral terms play a role in how we form evaluative concepts which aim to refer to certain properties as objectively prescriptive facts, not all speakers are using moral terms in association with the same properties.
Some speakers may, for instance, use moral terms in some unusual, idiosyncratic way. In short, our evaluative language and concepts could be non-cognitive, anti-realist, and yet the truth of our moral judgements can still represent objective or mind-independent features of the world. Such an argument could be formalized into something similar to the following.
P1. Moral terms such as "right" or "wrong" play a semantic role that an agent uses to refer to the moral properties of "rightness" or "wrongness"
P2. Moral properties of "rightness" or "wrongness" represent the state or condition of being either right or wrong in conduct or judgment.
P3. An agent refers to these moral properties with such terms based on the moral convictions they have formed.
P4. An agents moral convictions are formed through a subjective evaluation of these moral properties.
P5. Subjective evaluations are subject to interpretation and perspective.
P6. Interpretation and perspectives are fallible.
Therefore,
C. Terms such as "right" and "wrong" can be mistakenly applied to a conduct or judgment by an agent.
A Moral Naturalist would think of moral terms as being analytically equivalent to terms referring to natural properties. For example, Hedonism refers to the natural property of pleasure as being analytically equivalent to the moral term "good" whenever they claim that "pleasure is good". A Moral Non-naturalist would take the opposite stand in thinking of moral terms as being irreducible to terms referring to natural properties and would instead suggest that moral terms, if true, purport to report a fact that lie outside of naturalism.
Non-naturalists claim that terms such as "good" or "bad" are indefinable and therefore cannot be substituted with terms such as pleasure or suffering. Both Naturalistic and Non-naturalistic versions of Moral Realism avoid the problem of moral disagreement with the Semantic Moral Realist argument.
Though the argument for Semantic Moral Realism seems to avoid a threat raised by Anti-realist objections, it does nothing to defend the third proposition in question (that true propositions are made true by objective, mind-independent features of the world), that is, besides offering up an excuse of semantic incompetence for the lack thereof. This is where the second argument comes in which is known as the argument for Metaphysical Moral Realism.
The argument for Metaphysical Moral Realism takes two separate construals for its defense. The first construal suggests that there must be some connection between an agents moral convictions and the agents motivations towards a specific action. The argument states that any such moral proposition must necessarily have corresponding motivations built into them. From this premise, it is inferred, that, if an agent were both fully able to rationalize and also possess the knowledge of all the relevant moral facts, then the agents motivations would be guided by objective moral facts towards actions that are objectively "good" or that are, in fact, the "right" thing to do. Such an argument could be formalized in the following manner.
P1. An agents moral convictions are intrinsically motivating.
P2. An agents moral convictions may or may not be fully rational or based on all the facts.
P3. There are objective facts to be known about morality.
P4. An agent may achieve conformity between their beliefs and their reasons to believe such beliefs, as well as between their actions and their reasons for which they act.
Therefore,
C. An agent would be motivated to do what is objectively moral, if and only if the agent was fully rational and knew all of the facts.
This argument, which takes on a more naturalistic construal of Moral Realism, serves only to suggest that the existence of objective moral facts are merely logically possible. It remains a tentative explanation at best for a reason to believe that such objective, mind-independent moral facts do indeed exist.
The second construal of argument for Metaphysical Moral Realism suggests that moral facts are the same as mathematical facts. They are both abstract entities that cannot be fully explained through empirical observations (as natural facts can be) and this places them in a separate ontological category from naturalistic entities.
As a result, what makes some moral statements true propositions that are made true by objective, mind-independent features of the world lie in the relations between it and the features of the world that make it true. Such features need not be natural nor provide us concrete conceptions of the world, but rather need be supported by an a priori appeal to the ontology of concepts they are involved with.
Consider the two analogs of Mathematics and Logic. Both need not rely on empirical correspondence to be confirmed as true because they are systematically supported within their own conceptual reality. The following is an example of how such an argument could be formalized.
P1. Moral sentences sometimes represent a statement that is true.
P2. A sentence is true only if there is a truth making relation that holds between its contents being something that exists in the world and the proposition that such contents exists.
(A metaphysical bridging relation between what is true and what exists).
P3. True moral sentences are true only because they are held together by a truth-making relation between their existence and the things which makes them true.
Therefore,
C. The things which make some moral sentences true must exist.
This argument, in the end, also fails to substantiate the ontological premise needed to ground Moral Realism. It is a failed attempt to bridge the is-ought divide, on my view, and an attempt that must be successful in order for Moral Realism to justify its central ontological thesis.
How would Moral Realism achieve this goal?
Well, it would have to substantiate the claim that moral values exist as objective, mind-independent features of the world.
How would it do that?
Well, we could conjecture that human lives have an innate moral property of being Good; or, we could otherwise conjecture that there exists moral properties possessed by things in-themselves — that such things as happiness, pleasure, or honesty are in-themselves morally Good and thus analytically equivalent at a fundamental level — then, if our conjecture is accepted, the problem would be resolved and the gap would be bridged. This is essentially the Moral Realist approach and I do not find such conjecture to be convincing.
My objection to the Moral Realist approach would be that the whole theory seems to be begging the question. If we ask "how are human lives 'Good'", then, most often, the answer given is "because humans possess an innate property of Goodness" — or, "because they possess happiness and pleasures and such things possess natural properties that can be reduced to moral properties — such as Goodness." And just how is that not a premise assuming the conclusion? How do Moral Realists find this to be an acceptable justification?
Perhaps therein lies the problem — in the Moral Realist's justification. Let's touch on this a bit, as it makes for a nice segue into my second objection to your comment.
In epistemology, justification is a concept which describes a belief that is held by virtue of having good reasons and evidence to hold it. Morality is a system of evaluative beliefs used to generate principles that guide our conduct. Justifying moral beliefs is an important part of developing a moral system, because without good reasons for believing moral claims, morality becomes inconsistent. Without a consistent moral system, any behavior becomes justifiable.
With that in mind, it becomes clear why Moral Realism must overcome the is-ought divide in order to develop and maintain a consistent take on morality. Moral Realism, in order to be a consistent view, must derive a prescriptive conclusion from descriptive premises. They must state which claims are actually true and explain what it is about the world that makes those claims true.
The problem is that in order to derive a prescriptive conclusion, it is necessary to construct an argument containing at least one prescriptive premise. In other words, a moral belief can only be justified by another moral belief because prescriptive conclusions cannot be derived from non-prescriptive premises without either begging the question or running into an infinite regression.
Every prescriptive premise placed within the inference structure of a moral argument is attempting to justify another prescriptive claim. Every prescriptive claim, however, must then be subsequently justified itself by providing an additional argument containing an additional prescriptive premise. This would go on ad infinitum and thus such conclusions remain as unjustifiable beliefs.
Any belief that appeals to an unjustified belief for justification can never be justified. If there is no good reason to believe a claim we generally don't believe it. A claim that is begging the question, or a claim that must fall back on an infinite sequence of requisite arguments, is a belief appealing to an unjustified belief.
So, how does this trouble Moral Realism? It does because Moral Realism is making the claim that there exists an ontological grounding for our moral judgements and that requires crossing the is-ought divide. Crossing the is-ought divide requires each moral claim to be justified.
One problem is that the only way a moral claim can be justified is if it is itself justified by another moral claim — this becomes a problem. This problem is known as the infinite regress, wherein a moral claim must be justified by a chain of normative inferences that goes on infinitely. Another problem is known as circular reasoning which includes the concluding moral claim itself to be a built in presupposition within the premises.
So, if we say...
It seems like believing that you can’t defend an ought claim without making another ought claim is still perfectly compatible with moral realism.
Then we are conceding that Moral Realism is defeated either by virtue of circular reasoning or by falling into an infinite regression.
No one is ever justified in believing any moral claim that uses an argument which includes the same moral claim in its conclusion as the moral claim in its premises. If a moral claim is represented as one of the premises of the argument that is trying to prove the same moral claim as its conclusion, the argument is circular. The premise cannot support the conclusion, since the conclusion is merely restating one of its premises which cannot adequately provide the sufficient justification for a belief.
No one is ever justified in believing any moral claim supported by an infinite chain of inferences. Even though the justification for a moral claim could, in theory, go on infinitely, we nevertheless would never know whether or not such a claim was justified. If the entire chain of justification is not present for us to form a belief, then we can never know if we can be justified in believing it. If a single unjustified claim was present within the entire chain but beyond the reach of our limited scope of knowledge, it would undermine the justification of the entire chain itself.
Moral realists could just argue that ought claims can be just as objective and factual as is claims are. There doesn’t seem to be any obvious reason to think that they aren’t.
The reason that "ought" claims cannot be just as objective and factual as "is" claims are is because "ought" claims are prescriptive or normative statements, whereas "is" claims are descriptive or positive statements. There appears to be a lacking appreciation for the fact-value distinction. All "ought" claims represent statements of value, whereas all "is" claims represent statements of fact.
To begin, a "claim" is a type of statement that offers an assertion about an issue that can either be true or false.
Descriptive claims attempt to state the facts and give an account of how the world is through non-evaluative observations. The statement "What happens after we die is unknown" for instance, is a descriptive claim. Whether a descriptive claim is true or false is an empirical question. Empirical questions can only be answered through observations we make as we experience the real world.
Prescriptive claims, on the other hand, express an evaluation and give an account of how the world should be. A statement such as "We should be afraid to die," is a prescriptive claim. Whether a prescriptive claim is true or false is an ethical question. Ethical questions can only be answered by an entity with moral agency (an entity capable of generating personal values, a sense of purpose and who attributes meanings to things).
Some descriptive statements bear the truth for normative or prescriptive statements by describing a set of circumstances from which a value judgment can then be considered. To demonstrate this point, the claim, "Abortion is the deliberate termination of a pregnancy that involves killing the undeveloped embryo or fetus," is a descriptive statement wherein the truth of the circumstance described thereby raises a normative issue — whether or not killing a developing human fetus is desirable. Moreover, it likewise raises a prescriptive issue, namely whether or not abortions should be done. As a result of such a dichotomy, descriptive claims are seen in contrast with prescriptive claims.
Objectivity describes a feature of the world that is independent from the specificities of a mind, whereas subjectivity describes a feature of the world that is conditional on the specificities of a mind. Therefore, for a claim to be objective, it must be empirically falsifiable and describe mind-independent features of the world.
There are claims that make objective statements, such as "The sky is cloudy," that reflect reality and, in contrast, there are claims that make subjective statements, such as "I like a cloudy sky," that reflect a perspective through which a subject views reality.
For a moral claim to be a factual statement, it must contain facts — externally verifiable, demonstrable realities — based on empirical evidence. Furthermore, for a moral claim to be an objective statement, it must have some properties accessible through external reality and not just be privately accessible through an internal, mind-dependent reality.
Why even presuppose an objective moral ontology in the first place? I mean, given the subjective nature of human psychology, it seems that our cognitive and evaluative capacities do not require a philosophically objective foundation.