Sure, Zimmerman did some really shit stuff... No doubt about it. He instigated a situation that he could have easily walked away from. That doesn't instantly make him a murderer though.
Goes both ways Tu, Trayvon, could have easily just said "I'm going home" and proceeded to tell him the address of his fathers home.
Or for gods sake, he had a cell phone, during the whole "chase" if he was telling his friend "a creepy craka" is following me, why for all that is holy he didn't dial 911?
He should have been like Tiger woods when Fuzzy Zoeller, made that comment about, "fried chicken and collard greens" for the masters meal, just keep a cool head.
Again this is a act of when "keeping it real goes wrong".