I don't think you can find Zimmerman guilty of Murder, I think thatmaybeInvoluntary Manslaughter might have been possible, but still difficult. We know Martin backtracked to where Zimmerman was standing (You can look for the timeline that hodj and Tuco have linked in the previous pages). And even then, the most crucial moment is still missing from the timeline (We know the cell phone recorded Zimemrman and Martin confronting each other, but then cuts out after the struggle started). So all we are left with is Zimmerman's account, where he says Martin stuck first. We have no way to prove that one way or another, which leaves enough reasonable doubt to acquit.
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Personally, I think that morally/ethically Zimmerman was a goddamn idiot at best if not criminally reckless at worst. He went out that night looking for trouble and if this story proves anything, it was that his dumbass was not prepared for any kind of confrontation. This isn't the Wild West, this is the 21st Century and people do not need to go out there on some Vigilante hunt for criminals. Its stupid and dangerous because guess what... THEY ARE CRIMINALS WHO WILL KILL YOUR DUMBASS instead of a confused, angry teenager. What would Zimmerman had done if he actually stumbled upon the criminals he was looking for? Chased them too?
In the end all Zimmerman has managed to do is cause enough trouble that the criminals who were doing the breakins have likely moved to a different part of the town, pissed off the whole country, and killed someone who had the misfortune of walking outside that night. He failed in every way managable through his own arrogance. And that is the sadest part of this whole fiasco.