I am glad Zimmerman won, but I am not happy about the entire situation.
Yes, Martin may have been a thug and all that. But there is no real evidence he was up to no good on the night in question. I am all with the opinion that if a person comes up and asks what you are doing in the neighborhood to reply sensibly, as I lived in my fathers condo complex which had security guards who might come up and ask what you are doing out late at night in the complex. I would not have thought to start a fight with them. Once someone followed me home from the freeway (case of road rage) which in the end I spoke to the pursuer and ended up calming his anger (he said ultimately 'I had a bad day' to which I replied 'I also had a bad day', etc.).
But the question is whether the entire situation could have been handled better. While the text messages and photos paint a bleak picture I don't necessarily think that they are proof of anything relating to the incident. Yes, he has a history of starting fights and all, and he was suspended from school for some minor crimes (selling pot, and possible theft) but those crimes alone do not warrant a death penalty.
In my youth I was caught up in a lot of meshugah things. I was involved with drug use, once arrested for shop-lifting, and almost accused of resisting arrest in one incident. These things happened over 25 years ago and I have grown up into a respectable and G-d fearing man. I have been through the court system twice and both times I was victorious even though things could have gone the other way (I had great lawyers and sympathetic judges).
So while I support Zimmerman who I believe only shot when he felt his life was in danger I also feel that the entire situation could have turned out differently. You cannot know for sure what happened that night, so we must go with what we now know. So I support Zimmerman but do think the entire situation is sad.
In Judaism we have the concept of the 'city of refuge' where a person who had killed another (accidentally or though circumstances beyond his control) must go to avoid the revenge of the family.