I promise you you misread. I think this is probably the problem sentence

  >>>> The vast majority of smart people I know are very peaceful.

I'll also add that the vast majority of people I know are very peaceful. But neither of these means I don't know malicious people. You'd need to change "The vast majority" to "Every" for this to be the conclusion. I'm not discounting malicious smart people, I'm pointing out that it is a weird assumption to make when most people we know are kind and peaceful.

The second comment is explicit though

  >> So we can't conclude that greater intelligence results in greater malice.

This is not equivalent to "We can conclude that greater intelligence results in less malice." Those are completely different claims.