That is a problem. I think legally it may be a challenge - though not impossible - to convict Zimmerman of 2nd Degree Murder, but regardless of a conviction or not, I really don't believe Martin actually pursued or attacked Zimmerman out of the blue, the way Zimmerman claims, and, even if the kid did start a fight, Zimmerman still bears the moral responsibility of setting the entire event in motion through his irresponsible decision to follow Martin while carrying a gun. At no point in this can I see that Martin could have done anything that should have led to his own death. He was just a teenager walking legally down the street.
For those who accept Zimmerman's defense, or find his defense believable... uh, what would Trayvon's motive be in that situation? To attack a bigger guy who had had already left him alone? To beat this guy with lethal force?
I think it's odd that in looking for Zimmerman's humanity, Trayvon gets reduced to a thug.
I believe the latest story was that Zimmerman reached for his phone and Martin thought he was pulling a gun... of course, if I was in Martin's shoes, I'd leap on the guy too. In that situation, I'd see him as the attacker.