Because they're furious. Im not going to go on a long rant about this, but let me try to make a point. Let me also pre-face this with im a half-white/ half Filipino BLM supporting far-leftist, but i do not support the mindless killing of people, and i will try to stay as moderate as i can. Also, im sorry if i dont do a good job explaining. Im typing this as i fall asleep.

The black community (particularly in disadvantaged areas), is furious. This whole killing of unarmed African-americans has been going on for a very long time. Whether you think some of them were justified shootings, you cannot deny that a good portion of them are/were not. Only with recent video capabilities on phones has it come to the attention of the rest of America. After years and years and years of being on the wrong end of a systemic issue, communities are fucking furious. They've dealt with this abuse as slaves, after slavery in segregation, and post-segregation being beaten and killed by police while being disadvantaged economically and in other terms of the social world. And now it comes to the attention of mainstream white-America, and what happens? These cops get off free? That's absurd. That's absurd from our perspective, now what about theirs? That's got to be fucking ludicrous. Obviously justice needs to be served. So how do you fix things? Well, MLK Jr did things peacefully, right? But has that really helped? Of course segregation has ended, affirmative action is in place, and minorities arent getting hosed down by firefighters, but has the underlying issue really been helped? There is still a very obvious systemic issue going on, even after MLK. So, it would appear peace didnt really work, what now? Well, after peace comes violence. There was Rodney King awhile ago, and in more recent history there was Ferguson and Baltimore, then now. Murdering of two cops. Honestly, this is just following the evolution of forced change. I dont think its morally right, but its understandable. It's probably going to get a lot worse, too.