"A good man is intelligent, and a bad man is also an idiot. Moral and intellectual characteristics go together."
Borges

Yes, in most cases. But what about evil men of high intelligence - of which there have been many? The more refined intelligence becomes the closer it approaches to idiocy, closing the circle. We acknowledge this in the notion of the 'absent-minded professor'.

A powerful intellect probing the nature of morality finds what? An excuse (or possibly a compulsion) to be evil? Dostoevsky was very concerned with this particular question.