This is less software-related, but one trap smart folks can fall into is being afraid to seem not smart. Like let's say an authority figure is trying to do something that doesn't feel right to you, and you say something about it. And then Mr. Authority Figure says, "Come now, be reasonable or be rational ." The fear of being perceived as "irrational" may stop you from standing up for yourself or someone else.
On a similar note, "fear of not looking smart" can make it hard to ask a question. Often when I'm in a meeting and they're going deep into some technical thing I don't understand, I (nowadays) assume that everybody else is confused, too, and I ask the question. And then once I do, everyone else relaxes and follows up. But until that ice is broken, we're all sweating bullets trying to look like we get something we literally do not understand at all.