This Zimmerman fella should be held accountable to the law and impartial justice.
It doesn't look good for him; he was instructed by 911 dispatchers not to pursue, and he did anyway, and then shot an unarmed kid. I don't know how much more cut-and-dried it could be, unless there is other evidence presented that changes the dynamic. But the possibility of additional evidence is a real possibility, so public judgment should be withheld.
Aside from that, it's important to remember that Florida's "Stand Your Ground" law is specific, and if Zimmerman is guilty of murder or manslaughter, he BROKE that law - he did not use that law as a justification for killing. SYG will be demagogued, but unjustly so. The very real possibility exists that if Zimmerman had followed the SYG law, the boy would still be alive, and Zimmerman would not be under scrutiny.