The public has grown tired of police shooting African America citizens with impunity.
Lets talk about impunity, that means without fear of reprisal or punishment. Pretty sure at this point, virtually no officer feels that way anymore, they know damn well that any shooting of a black man is going to receive a lot of looks. I think nobody is in favor of police shooting people who dont need shot with impunity. But lets be clear. There are people who should be shot, and using those cases to make the case about impunity doesnt help at all. This guy grabbed his handgun while in an altercation with the police. So, like Freddie Grey, you might want to not choose this case to make the above statement. I"m certainly against officers shooting when they shouldnt, and even more vocal about departments working overtie to try and hide and protect officers who do shoot people who didnt need shot. But this case looks pretty open and shut.
Focus on the cases where there is some question, dont riot over people who got themselves killed by being stupid. When I see Sandra Bland and "Gentle Mike" on the list of those killed by cops, I stop listening to whomever made that list.
EDIT: Shout out to those who insist on body cameras. As a lot of us suspected, they show clearly that the great majority of cops are people just doing a good job. And yes, helps make the case against bad ones.