Mary: It's okay to be smarter than everybody else, but you can't go around pointing it out.
Mary: Because people don't like it!
Sorry for the quote. It's rare that BBT-quotes are on topic, so let me have that moment.
People don't dislike smart leaders. They dislike people that make them feel stupid. And with half of the people that's pretty easy to do if your intelligence is even just average. What they like is people that make them feel smart and superior. And that's easy to do for someone who comes across as an idiot.
That might have been true for Bush Jr., but not for Trump. Trump is an asshole, but he ain't stupid. He doesn't even fake being stupid. Then why does Trump "work"? Well, mostly because Hillary didn't, but even that's secondary. Trump offers easy answers to very complicated question. Answers that can be understood by anyone, and as long as nobody questions them or even has to implement them, that's fine.
Unfortunately that only gets you so far. That's basically what fell the Soviet Union. Lots of rhetoric but very little substance in the end, and the smokescreen of martial words and promises eventually evaporates.