mattiasNYC said:I agree with the last sentence, but not about rationality. I think the definition of "rational" that you're applying seems to be too narrow. Sure, I do think that the word can be used to mean that if I want your car and I have a gun I could kill you and take your car then that was me being rational. There's a logical thread there. But on the other hand there's also the threat of me getting caught and then punished for the crime I committed, after which the net effect would be negative (i.e. the punishment is far worse than the benefit of the crime was good).
So I think "rational" is a somewhat "iffy" word to use here.
I seem to recall reading that some types of mentally ill people will act in accordance with local cultural norms, however not because they are in agreement, but because they understand that punishment will happen if they don't.
If your going to do the crime you should be willing to do the time. It all would factor into worth it or not worth it. A rational decision.
If you kill your spouse in a jealous rage I think it's less clear. But we put those people in jail not a mental hospital.
You don't have to be mentally ill to obey local social norms. Most people do it when they travel.