I've generally found that the most intelligent people have had overall delightful dispositions, and it's the above-average-intelligence folks who, being obsessed with smartness, are far less happy.
Just from the other day, "A study of ethicists finds they’re no more ethical than the rest of us".
https://news.ycombinator.com/item?id=19529374
I think people are simply people, no matter how smart or educated they are. Prone to jealousy, pettiness and subject to all of human pitfalls. Of course the smarter and more educated you are, the more damage you can cause.