Very smart people, like everyone else, have emotional responses to situations, then fit a set of rationalizations to what their emotions tell them in the first place.

I would like to give better answers in the aggregate-maybe we can gather some more evidence, but I'll just give a few well-known examples of people who would've done very well on IQ tests:

Ayatollah Khomeini Hermann Goering Alan Turing and Friedrich Nietzsche, both of whom sadly ended their own lives. Unfortunately, that is fairly common among the highest IQ scorers.

Intelligence is not the only personality trait to consider.