The whole issue, baz, was that there was a strong case to be made that this incident was racially motivated. In other words, the fact that the victim was black is pretty much the main reason the case came to light. It was alleged that Zimmerman saw the young black teenager, and assumed because of his race that he was up to no good. Then, it is further alleged, he shot the boy dead without having any cause or provocation. Again, if this were true, what other reason could there be than because Zimmerman saw a black man and automatically assumed that he was a danger? He wasn't the first, and he will not be the last, to have jumped to conclusions like that. I've been guilty of it myself at times, I'm sure. The difference here is that he had the means, in his gun, to do something about it -- and a young boy's life has been snuffed out.
The jury has acquitted Zimmerman, perhaps because there was more to this case than I am aware of. But rightly or wrongly, the victim's skin colour is entirely relevant. Either it led to the killing of an innocent victim because a man with a gun jumped to conclusions and shot him; or it led to an entire country, indeed many people across the world, crying foul just because the victim was black. Someone here has been racist.