Wow... I grew up in Jacksonville. The area this happened in used to be one of the nicer safe areas in town.
Not knowing all the facts I don't blame the officers for the shooting. If they saw the kid and shot anyway then I'd feel differently, but it sounds like they did the best they could under the circumstances.
I have to say though, I'm quite glad I'm out of Jacksonville. I just went back last Thanksgiving for the first time in nearly 10 years. All I have to say is wow... what a dump.