This has probably been building a while, honestly. I mean, look at the other shit before this: Zimmerman got off with zero charges (to my knowledge), and even the Rodney King trial that sparked the LA Riots back in the 90s didn't lead to much of shit in terms of actual change. People that want change notice when they don't get it, or when they're given meaningless platitudes in its stead. People, and not just those directly affected, are rightfully pissed off because, once again, we're being told that, unless you're white, you're not going to get a shred of protection under the law. This is one of the reasons fucking gangs exist in the first place, and if you piss people off enough, they will eventually break and start to run riot. Its happened before at many, many points in history, yet folks in power never quite seem to learn the fucking lesson. This is what happens when you disenfranchise people.