One of the biggest problems with US culture these days is that ignorance is seen as a virtue. People are encouraged to believe just whatever they'd like to believe, and to reject any facts that conflict with what they'd like to believe. People actually pretend to be stupider than they are! Anyone who 'knows too much', who knows what he's talking about, we don't trust him.
The Republican Party really takes advantage of this trend, and helps to drive it. The previous Republican president graduated from the two most prestigious universities in the New World but stumbled over any word with more than two syllables. The current Republican president feels justified in just making sh*t up as he goes along, just saying anything, true or not. Both of them, their main campaign appeal was "Vote for me, 'cos I'm just as ignorant and opinionated as YOU are!"