They know to plan ahead, organize and mobilize the mob.
Of course the FBI seems oblivious to this.
Throw ‘em in the river and let it take them to the sea
That is because they have been ordered to look the other way. And they follow orders.
Their official policy is that "White Supremist" organizations are the greatest threat to "Our Democracy"(tm). Deviations from that policy are not allowed.
These "Mostly Peaceful Protesters"(tm) are set on stage by professional "Community Activist" project managers, who are paid by a network of "non-profit" and "non-government" organizations. Much of that funding is from government sources.
The people who own our government want all of this to happen.