The problem is that Donald Trump is a bull shit big bang. He's producing so much bullshit day by day, on Twitter or anywhere else he goes that most people have just given up trying to refute it. So he keeps on spitting his bullshit all along, which blurs and clouds the reality more and more while his real agenda is hidden somewhere deep underly that gigantic bullshit universe he created and grows every day.
And while he might look like a simpleton - if you want to get heared, then your language should be simple. Nobody fancies words the majority cannot understand at once when he wants to win an election.
George Orwell wrote in his essay
"Politics and the English language" this: "Never use a long word where a short one will do. "