I don't agree that the Donald Trump subreddit is the heart of the problem. It's a symptom of the problem. I don't care what goes on in that subreddit. Let them have their echo chamber. The problem is huge default subreddits that purport to be neutral but actually are far from it. This is what pushes users to the extremes, one of which is the Donald Trump subreddit, which got a lot of subscribers because of this fiasco.