Push a man long enough and he will push back. Blacks have been screaming for out against white brutality, police brutality and harassment for four hundred years and finally we are paying attention. We are standing with him and saying enough! The police answer to no one with their immunity clause. Police unions assure that bad police get chance after chance and when caught or fired they just move on to another city.
Imagine that you saw Chauvin with his neck to a man's neck as he cried out for air and no one dare question the police. Someone could have saved Floyd's life, but at the risk of their own. We defer to authority figures so much so that Trump gets to make shit up and facts are no longer facts. They are opinions.
Don't forget that The Donald took out a full page ad in the NY Times calling for the death penalty for the Central Park 5 who were exonerated after being denied access to their parents during questioning and bullied into confessions by those who are supposed to protect and serve them. Why is it that in America the "usual suspects" always seem to be people of color?