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To me, using the word "rational" to describe habitual behavior that makes a person hate themselves and their life for most of their waking hours is a curious practice that belies other uses of the word.

You can do it - we are doing it - but it lacks parsimony in the ways I think matter. Or rather: it's extremely parsimonious in a nonsensical way that breaks badly in complex settings. But beyond what I've already said, I have no crisp alternative.

The better formulation is probably in the realm of philosophy, as @Undisciplined mentioned previously.