I don't think it's so much the IQ that causes self-sabotage. The thing that happens is that if you have a big brain, you tend to try to use it to solve every problem. Guy who has a hammer sees a nail everywhere. After all, IQ is seen as a kind of tool for everything, so why not?

So you get these smart people who think they can rationally work themselves out of emotional issues.

Well, if you lift with your back, you hurt your back.