Anyway we will have the proof of the facts soon, weeks from now at worst, while we already saw what the left wing did when Trump was firstly elected in 2016, now we will se what the right wing does after Trump is sent home.
I hope and even believe to a certain extent that nothing serious will happen but that also depends on how much Trump will try to excalate the tension, if he arrives to the point to say "this election is a fraud so a) I will not leave or b) people go protest in the streets for our rights (to have me as the president)" that can become a huge problem on the other hand even if Biden lost I don't see him do what Trump will most likely try aka do anything, or almost anything, to try to keep his role.