If you want a violent crowd, take a peaceful one and start firing pyrotechnics and "less than lethal rounds" into it point blank. If they can scatter readily, they often will, if not, they will turn on you.
Let no crisis go to waste.
If there is no crisis, create one.
Note, in the upper right, the group pounding the window out has their back guarded by either masked people or those who have their trump gear on backward, which is rumored to be how the ANTIFAs masquerading as Trump supporters were to be able to identify each other in the crowd. Their battering ram is a cardboard tube.
Guy ramming the door with the bike rack--also masked.
Agents provocateur abound.