A moral realist who doesn't accept ordinary language philosophy will offer a different argument. — Michael
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I prefer
moral naturalism to "moral realism", Bob, because the latter concerns 'the meaning of moral statements about states-of-affairs' (semantics) whereas the former (a subset or kind of moral realism) more precisely concerns,
in effect,
'defeasible reasons for moral statements about natural beings' (pragmatics). These 'moral reasons' are objective insofar as the functionalities or properties of natural beings to which they refer are objective. No doubt just as one can use mathematics or chemistry subjectively, one can also use 'moral statements about natural beings' subjectively; however, such unwarranted subjectivization (or relativization) tends to be incoherent and vacuous.
Anyway, simply put: (1) it is a fact of the matter that every natural being is
inseparable from the natural world; (2) natural beings capable of
normativity require
reasons (i.e. facts/evidence-based
claims) for doing things
as a rule and for not doings
as a rule;
(3) normativity that specifically concerns the species' defects (i.e. vulnerabilities to harm / suffering) of natural beings, however, is moral (i.e. obligates natural beings to care for one another) insofar as natural beings are cognizant (how can they not be?) of their species' defects as such; (4) and in the normative framework of moral naturalism, (our)
species' defects function as moral facts¹ which provide
reasons² (i.e. claims (e.g. "I do this³ because² 'not to do this' can/will harm¹ her")) for species-members (us)
to care for³ – take care of³ – (our) species' defects
as a rule we give ourselves.
(NB: A rule itself does not compel compliance, however; 'following a rule' is
usually a habit acquired through practice for which, at best, there is a compelling reason
independent of that rule.)
We can have reasons to believe something, to do something, to have some desire or aim, and to have many other attitudes and emotions, such as fear, regret, and hope. Reasons are given by facts, such as the fact that someone's finger-prints are on some gun, or that calling an ambulance would save someone's life. It is hard to explain the concept of a reason, or what the phrase 'a reason' means. Facts give us reasons, we might say, when they count in favour of our having some attitude, or our acting in some way. But 'counts in favour of' means roughly 'gives a reason for'. The concept of a reason is best explained by example. One example is the thought that we always have a reason to want to avoid being in agony. — Derek Parfit, On What Matters, vol. 1
re: Some of h. sapiens'
defects (which are self-evident as per e.g. P. Foot, M. Nussbaum):
vulnerabilities to
- deprivation (of e.g. sustanence, shelter, sleep, touch, esteem, care, health, hygiene, trust, safety, etc)
- dysfunction (i.e. injury, ill-health, disability)
- helplessness (i.e. trapped, confined, or fear-terror of
being vulnerable)
- stupidity (i.e. maladaptive habits (e.g. mimetic violence, lose-lose preferences, etc))
- betrayal (i.e. trust-hazards)
- bereavement (i.e. losing loved ones & close friends), etc ...
... in effect,
any involuntary decrease, irreparable loss or final elimination of human agency.
This sketch (influenced by Laozi, Epicurus, Spinoza, Peirce-Dewey, C. Rosset, A. Murray, D. Parfit, M. Nussbaum, O. Flanagan, P. Foot et al) supports only one type of 'moral realism', Bob, and rejects error theory / moral nihilism (etc) as well as all forms of moral supernaturalism (e.g. divine command theory).