There would have definitely been very acrimonious protests attended by people who are much more likely to own firearms than the population at large. And protest

There would have definitely been very acrimonious protests attended by people who are much more likely to own firearms than the population at large. And protests can lead to civil war, look at Syria for example. Not to say it’s certain or even likely, but it’s definitely plausible. You are much more confident than I am that the military and police would remain 100% loyal to Biden during a protracted period of civil unrest where one side believes two general elections in a row were stolen from them and their leader assassinated.