I'm going to defer to the courts
BUT
It is my current opinion, based on what has been released so far to the public, which is not everything, and not conclusive, but it would appear that Mr. Zimmerman escalated the situation by pursuing Trayvon Martin, which resulted in a shooting. That he has been charged on the merits (at least partly) says that there is sufficient reason to warrant that opinion legally. So I guess we'll see. I think he should have called it in, and watched, and not gotten in the truck to go after him.
Again, that's a current opinion, not a belief I'm going to get super-defensive about, just armchair musings.
Very interested to see how it plays out though. If a dumbass gets into some biznass with a thug, who's wrong? heh