There's a lot of people who were involved in the Mike Brown protests that had witnessed firsthand shady white men intentionally breaking windows and throwing **** to rile up the police. Hell, there are vids on Twitter right now showing shady white dudes breaking into stores with black protesters yelling at them to stop.
EDIT: Just stumbled across this and that loud bang you heard was my irony meter nuking itself. https://twitter.com/NFL/status/1266852547890839552