For the most part, this wasn't a "violent" mob. It certainly wasn't like we see in political revolutions in other parts of the world where they are being supported by military and para-military forces. This was mostly a bunch of drunken college students "going crazy" and "having a good time." It appears that only a handful ever did anything truly violent (tipping cars, knocking over light poles) and a few more were lobbing beer cans from the back of the mob (how brave of them). The main acts of violence seem to be just a few people deciding on a whim to do it. The fact that it didn't happen more often tells me that the mob wasn't really all that violent. It wasn't like they were going down the street tipping every car, breaking every window, taking down every light pole, etc.
I'm not sure that I would want to be one of them, but if a few had tried to prevent the car-tipping and light pole-breaking, we might still have VEISHEA and not be looking like idiots on national TV.
So they committed violent acts but they weren't violent?
If there's something I know about drunken college kids it's how open they are to random people telling them what to do. If someone was dumb enough to try and stop them it would probably have ended in someone getting their *** beat.