If a person riots and damages his community, it is his fault. It's not anybody else's and it doesn't really matter the reason behind because those reasons can be created on a whim and there are always other options that can be taken. For example, if a cop shoots a black man because the black man proved himself a danger (and I'm not saying that there haven't been unfair shootins, but those are not typical) the answer is to keep pushing the bureaucracy for the justice, not destroy your community because the only ones that will suffer from that destruction are you and your neighbours.
Governments might be slow in doing things, but even they can't resist constant pressure.