Mass shootings are very frequent in the US, are you telling me at least some of the people who do it wouldn't jump on an armed insurrection train? Specially then when a LOT of people view it as defending democracy?
If Trump loses bc he was not in the ballot on states he won before or was on track to win, that won't seat well with people one bit. Specially if Biden is switched at the Convention for Newsom. I think that would add salt to injury, and wouldn't end well.