I think the real danger is Trump winning... or getting so close that the election is a toss-up... or very close to that. I worry that the results will be thrown into question and that will tear America apart.
There's a very real chance ee see something akin to the election 1860, with the Democrats solidly behind Biden and the Republicans split between 2 or more candidates. Biden wins and the reds throw a fits, just like last time.