Zero chance any of that would have happened. It certainly could have gotten more ugly than it was. But a loosely organized mob of protestors is not going to achieve that. One SWAT team, or the military if necessary, would have dealt with it easily.
Is this likely? Maybe, maybe not. But I tell you what. There is more danger to under-emphasizing the threat than over-emphasizing the threat. Indeed, fear and control over executive power is at the core of our Constitution and founders' fears. I will not play down what happened, and who instigated it.
The general mob could also have quickly instigated a massacre. Chants of "Hang M. Pence."
Over-emphasize isn't enough. It has to lead to the right actions rather than to damaging ones.