Some things hard hard to accept at the time, Bill Clinton being a serial predictor and rapist would be an example of how people lose their mind and become devoid of rational thinking, at the time. Only too look back decades later to admit they were wrong.
Trump is a troll, that should not be mistaken for idiocy, he lies and exaggerates, something not to be mistaken for idiocy either. Does it make you feel superior to call him an idiot? I’m sure you can give a list of examples, but then for anyone in the public eye making as many public comments and decisions, who couldn’t make that claim?
Why the Bill Clinton comparison? Well because he won the presidency over 16 other Republicans and a Democrat candidate that had every help in the world, and so far and despite the efforts of people in both parties, just about the entire media and it would seem the heads of intelligence agencies is still hanging on.
The evidence and facts would suggest a stupid person would have been defeated long ago. Yet there he is, still President. Ergo, not quite as stupid as you think.