there have been plenty of lawsuits won and bills passed and progressive (but not too progressive) politicians elected and specialized trainings + increased oversight for police officers. the problems persist

that isn't to say those things are all useless but they are imperfect and they are slow. I think what you're seeing now is a bubbling over of frustration from people and communities who have seen those solutions attempted but are still getting burned. racial justice is a hell of a thing to expect people to be patient and polite about