One would treat this as a reductio, that shows the supposed argument to have gone astray. That one ought not eat babies takes precedence over the argument. — Banno
Use of this Latin terminology traces back to the Greek expression hê eis to adunaton apagôgê, reduction to the impossible, found repeatedly in Aristotle’s Prior Analytics. In its most general construal, reductio ad absurdum – reductio for short – is a process of refutation on grounds that absurd – and patently untenable consequences would ensue from accepting the item at issue. This takes three principal forms according as that untenable consequence is:
1) a self-contradiction (ad absurdum)
2) a falsehood (ad falsum or even ad impossible)
3) an implausibility or anomaly (ad ridiculum or ad incommodum)
The first of these is reductio ad absurdum in its strictest construction and the other two cases involve a rather wider and looser sense of the term.
But why is it a response to my post? — hypericin
The challenge to moral realism is in asking about what's moral for homo habilis, or homo erectus. — frank
That's a challenge for some theory on normative ethics (e.g. utilitarianism, hedonism, etc.). Moral realism is a theory on meta-ethics and so it doesn't need to answer this question. — Michael
This discussion is on meta-ethics, not descriptive ethics, and your post seems to be discussing the latter. — Michael
with which I was agreeing.If it could be proved that I ought eat babies I still wouldn't. — Michael
So we apparently take as true that one ought not eat babies. — Banno
Certainly not descriptive ethics. If you don't like my instinct example, go with your version of moral subjectivism:
"One ought do X" is true when everyone believes it's true.
It is not a valid objection to say "Why ought I do something just because everyone believes I should?".
Because it is not an ethical theory that says "You ought to do what everyone believes you should".
It is a metaethical theory that says "The truth of ethical propositions arises from everyone's belief in them".
Raising an ethical objection to a metaethical theory is a mistake. Because it is an is theory, not an ought theory, even though its subject is ought statements.
an hour ago — hypericin
The question is: is morality only for humans? The idea is that if morality is only for homo sapiens, then morality is artificial because there's an ancestral continuum between humans and their forebears.
If morality is artificial, then moral realism fails. — frank
X is immoral for us. The challenge to moral realism is in asking about what's moral for homo habilis, or homo erectus. They're human. Are they us? Or not? The answer is going to be somewhat artificial, which means morality is artificial. — frank
Human psychology isn't a slave to some supposed duty. — Michael
Humans are biologically distinct from non-humans yet human biology isn't artificial; — Michael
Again, for the third or fourth time, your purpose here is obscure. It's not clear where your reasoning leads, or where it comes from. What's your point? Are you supporting subjectivism, or just positing it for the sake of discussion? — Banno
Even if you want to pick a certain point where there was a mutation, this choice for where we draw the moral line is going to be arbitrary. For instance, we know that Homo Sapiens and all our close relatives have a mutation that makes our jaw muscles weak. That would be an objective separating line between us and the other animals. But why would having a weak jaw make us subject to moral rules? — frank
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