I can't find it right now, but something came up a few years ago (probably on HN) about highly intelligent people being more adept at making up arguments to rationalize beliefs and actions that they had taken for other reasons entirely.
Sort of makes sense that wielding a more complex mind would offer more complex ways to go wrong, doesn't it?
Sounds more like “intelligence” isn’t the only defining metric for such behavior to occur in people, because that describes a lot of less intelligent people too. Though, I suspect highly intelligent people are at least somewhat more likely to end up on the “correct” side of the facts.
I have seen people I consider as much smarter than me fall for some very idiotic things. I certainly don't consider myself immune.
I think that the advice to try being intellectually flexible is a good one. Strive to learn new things, expose yourself earnestly to ideas that challenge your beliefs, exercise empathy, etc