Long long ago in this here Milky Way Galaxy, my ex-wife asked me a question, “Farm Boy, how can an intelligent fella like you be so nice?” The assumption was that intelligent men were/are unscrupulous in using their intelligence. Probably, many of the intelligent men that she encountered in the past were like that. The flip-side of that thought is that less intelligent men are more moral because they are less able to flaunt morality. But then again, many bad-boy types are not particularly bright.
Here is the more general question: What is the relationship between intelligence and morality/niceness? Perhaps there isn’t one.