You can see how the people are acting. This possibility that they JUST STARTED acting like this, AFTER a random unprovoked attack by the guy that the mob is attacking,
is absurd. Especially given that the behavior we see, has been a standard lefty tactic for years now.
You can also see how the driver of the Truck is acting. If he had JUST driven over an innocent woman just standing there minding her own business, why did he continue to slowly drive away, giving the mob a chance to collect around him and attack him?