Donald Trump believes what he's told. The problem is, a lot of what he's told isn't true.
When he acts on things he thinks are correct but aren't true, that's inconvenient if it's just him. It's bad if he uses his misguided knowledge to make decisions as the President of the United States.
More terrifying than Trump: the booming conspiracy culture of climate science denial
"The problem is not that these [fake news, conspiracy theory, and climate change denial] sites exist but that not enough people seem to know the difference between actual news, fake news, partisan opinion and conspiratorial bullshit. One of those people is the president-elect of the United States.I've seen a lot of that in action. If you don't question the news you hear, and you only get it from sources with particular points of view, your thinking becomes very, very biased -- and your mind becomes very, very hard to change, even if real facts and hard evidence are all in opposition to what you think is correct.
Either that, or people don’t even care to differentiate between fake and real, especially if what they read taps into their own prejudices."