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 shit 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