Because you arguing that rampant misinformation is not a threat to a well functioning democracy is so manifestly nihilistic and trollish there's really no point in even discussing it further.
There's a lot of people in denial that there is a genuine grievance at the heart of voting for Trump.
People who voted for him are not all misinformed racist sexist delusional hicks. There's too many of them to all be fooled. Many of them voted for Obama last time; the numbers make that clear.
Denial is the biggest thing I see in the US media right now, and it's worrying. Because it will probably lead to opposition to the symptom (Trump), rather than the cause (what motivated people to vote for him), and will promote internal opposition. It brings heat, not light.
How well do you think the average voter, whether Trump or Hillary supporter, would do on a Politifact quiz?
I believe most of us are misinformed and delusional, and I do not believe people having Facebook as their primary news source is improving the situation.