Cool.
Yep. So long as one does not take the relation form “is” to “ought” to be that of entailment, all is well.
Yep. Here we agree. In the OP:
Where it is relevant is in showing how emphatic our biological imperatives can be. Needing to shit is much closer to another example used by Foot, falling. In the article used elsewhere, Morality as a System of Hypothetical Imperatives. She uses it in an extended argument against there being a “special” use of “must” and “have to” in ethical considerations. See the related thread:
“I felt I must”, “I felt I ought”, we say such things about our actions, even when they are voluntary. As “I felt I was falling” can be true when one is not falling, “I felt I was obliged” might well be true when one is not obliged. Having the “feeling” is insufficient to having the act or the obligation.
So she writes:
There is no difficulty about the idea that we feel we have to behave morally, and given the psychological conditions of the learning of moral behavior it is natural that we should have such feelings. What we cannot do is quote them in support of the doctrine of the categorical imperative. It seems, then, that in so far as it is backed up by statements to the effect that the moral is inescapable, or that we do have to do what is morally required of us, it is uncertain whether the doctrine of the categorical imperative even makes sense.
So: is the need to act morally biological, in the way of the need to take a shit? The latter seems more emphatic than the need to act charitably, or the need to follow the categorical imperative.
In basing ethics in our biological needs, Foot suggests the comparison. But as you and I have pointed out, this comparison can only go so far.
Hence this thread - to explore the relation between our biological and moral compulsions.
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I’m going to resist empathy as a source for moral action. Not because it is not relevant, but because it is insufficient. A sadist has empathy for their victim; but empathy is insufficient to make them behave appropriate.