BLM as an organization has existed since 2013-2014. Before 2020, has there been any violence from anti-police-brutality protesting? The protests have been incredibly peaceful for years and years. What you're seeing now is a response to the lack of action boiling over. When voting and peacefully protesting doesn't stop the government executing American citizens in the streets, what do you do next? What's left? When you get thousands of angry people together, it's just going to result in some bad actions, unfortunately. If you want the violence to stop, then stop giving thousands of angry people reasons to gather.