Even if the evidence shows that Treyvon Martin was attacking him, Zimmerman acted with reckless disregard by pursuing Martin after repeatedly being told not to. Zimmerman was the aggressor, and he shouldn't be able to hide behind self-defense when he was ultimately responsible for the whole situation snowballing out of control. I think racism is irrelevant when it comes to determining whether a crime was committed or not. Is Zimmerman racist? I think his actions show that he is somewhat, even if only at the subconscious level(something I think everyone could be guilty of at one point or another in their life). Does it matter that his motivations were racial? No, it does not, and I think bringing in the racism aspect of the situation just muddies up the whole issue.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell