Over the past few weeks, the streets of American cities have been filled with protestors justifiably angry about the murder of George Floyd and the larger pattern of police violence against black Americans. Likewise, our social media feeds have been flooded with photos and videos that range from the horrifying to the uplifting. Amid the clarity of the message that black lives matter, though, this unrest has caused confusion at the margins. When a protest becomes violent, it isn’t always clear who has precipitated the shift. Far-left extremists, protestors, far-right white supremacists and law enforcement officers (who have in some cases removed their identification tags) are all potential perpetrators.