That case is quite simple: If Travon Martin had not attacked Zimmerman he would still be alive today! Simple as that. But Martin knew he was much stronger, so attacked and attempted to kill Zimmerman with brute force. He ignored Zimmerman's gun, at his peril! This has nothing to do with race, other than Martin, a very strong young person, just knew he could destroy Zimmerman, for no reason.
Those who try to make this a race issue show gross ignorance or stupidity, since race had nothing to do with it!