Donald Trump has some pro level cognitive dissonance.  He’s able to grasp on to two conflicting ideas with a vice like grip. I suspect part of that comes from a profound ignorance, and an unwillingness to get the facts before forming any kind of opinion, but really, having the willpower to push through hard rationality and logic to believe two diametrically opposing ideas takes a special kind of person.  And Trump is definitely special.  Take his stance on anonymous sources.  He praised the unverified, unproven stories about China being responsible for the 2016 hacks on the Democrats, a story that relies exclusively on nameless sources, then within hours, he goes on an internet rant about how anonymous sources are always made up, and are the tools that “fake news” uses to sell the public the big lies.  A rational person would either come to the conclusion that either the China story can’t be true, or that anonymous sources have their place in legitimate journalism.  And a rational person with even a modicum of internet research ability would probably come to both of those conclusions.