That's a mighty big if. The police did investigate and were told by the DA not to press charges because there wasn't evidence to convict. The "special" investigator was sent in to appease the masses and calm the tension. There was never a doubt that an arrest would be made and charges would be brought.
Don't get me wrong, I think Zimmerman is an idiot who unnecessarily put himself in a bad situation. I have no idea what the actual facts of the case are any more than anyone who else. That hasn't stopped anyone from taking sides. I think he created a confrontation that he could have avoided and then, probably justifiably (at least legally) shot in self-defense. I would not be shocked to find out I'm wrong either. I don't know that anyone other than Zimmerman will ever know the whole truth about what happened there.
I hope that the real facts come out and that justice is served. I have no idea which outcome is justified but I do know it will be difficult if not impossible for Zimmerman to get a fair trial. How would you like to be a juror knowing that the Black Panthers may put a bounty on your head if you don't produce the right outcome? The whole thing is a mess, that's for sure.
It's amazing to me that the black panthers aren't considered a terrorist group like the Klan.