This is totally different than the Zimmerman thing. Totally different set of facts. The shooter was not in any danger or under a threat. He had lots of other options than shooting.
I don't feel bad for the kid, he kinda got what he deserved, and probably saved the community from a lot of costs over the next 30 years (if he were to even live that long).
Unfortunately, since the neighborhood has to call the cops or shoo the boy away, he simply comes back again and again because he's confident he won't get caught. Good people in such communities see the writing on the wall, and simply exit the community, and the neighborhood goes to shit in less than a decade. Maybe the law should allow for such actions, but right now it doesn't.
Also, this isn't a racial issue. The kid would likely have gotten shot regardless of what color he was. The shooting happened at 2am, and most likely the shooter had no idea the race of the victim.