You sound like some of the idiots on the left who are claimed that the burning and looting this summer was caused partly by those people who support Donald Trump
The idiot governor of Minnesota tried that claim and people didn’t buy it and they’re not gonna buy that it was really all ANTIFA and Black Lives Matter in Washington DC
A few well placed agitators are like a turd in the punchbowl. They make a mess of things, use the crowd momentum in the heat of the moment to incite people to do things which are unwise, and then slink off to the side while mayhem ensues.
Agents provocateur have been known for centuries.
Look at the people with bullhorns. They use these to drown out anyone who has a different opinion, or who recommends more reasonable action, much like internet trolls.
It has been reported that at least one busload of ANTIFAs was brought in, and I doubt they were sailing paper boats on the reflecting pool.