It would be trivial to contrive that exact scenario.
I’m not say that it was contrived, just that it would be trivial to do so.
But at the same time I think peaceful protesters would not burn police cars or loot, seeing how looting does absolutely nothing good whatsoever for their cause. They would especially not burn or loot minority businesses, churches, or low income housing complexes. Someone is very deliberately and efficiently pouring gasoline into this fire IMO, that much is pretty obvious by now.