If Zimmerman's head had been slammed on the sidewalk a few times, wouldn't there be blood? We've seen the police video after the incident, and there's no blood, no evidence Zimmerman was injured at all.
Why do you so desperately want Zimmerman to be innocent on this? Is it that you can't bear to see any victory for those that Zimmerman referred to as "f***ing coons?" Or is it because Obama spoke about it briefly and you somehow, in your delusional state, think this could hurt him in the election?