Will_Sawin comments on Pluralistic Moral Reductionism - Less Wrong
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But why are rational thoughts good? Because they produce rational actions.
The circular bootstrapping way of doing this may not be untenable. (This is similar to arguments of Eliezer's.)
You're making hidden assumptions about what "good" and "rational" mean. Of course, some people accept those assumptions, that's their prerogative. But those assumptions are not true by definition.
Yes I am making assumptions (they're pretty open) about goodness and rationality. Or better: hypotheses. I advance them because I think theories constructed around them will ultimately cohere better with our most confident judgments and discoveries. Try them and see. By all means try alternatives and compare.
Circular bootstrapping is fine. And sure, the main reason rational thoughts are good is that they typically lead to good actions. But they're still rational thoughts - thus correct - even when they don't.
I think if you accept that you are making "assumptions" or "hypotheses" you agree with me.
Because you are thinking about the moral issue in a way reminiscent of scientific issues, as a quest for truth, not as a proof-by-definition.