You don't have to be smart to be dangerous. Most demagogues aren't particularly clever people, but, like all bullies, they instinctively know how to exploit the weaknesses of others. That's a lizard-brain function, not a function of higher reasoning.

Besides, while I fully admit that many of us, including myself, did underestimate Trump as a viable candidate, we aren't the ones who elected him. He isn't president because people underestimated him. He's president because too many people actually bought into his cr@p.