Even if they started many of them, why would they admit to it?
There is nothing to gain, and a lot to risk. There are already a lot of people calling for them to be classified as a domestic terrorists.
Perhaps they want now to be perfectly clear.
“Vote Democrat or else.”
Antifa benefits because they are Marxists in search of fear and anarchy, to use it to overthow the American system. By getting people to think Antifa started all the wildfires, they gain both fear and anarchy.