We now know that Zimmerman was injured by Martin. That no witness challenges Zimmerman's account.
That Martin was a "gangsta" (his own words!). That Martin did not call for help. Even with a cell phone in his hands, he didn't call 911. There is a reason they didn't charge Zimmerman until politics got involved. They have no case.
Right off the bat, they knew it.
Two people fight and one gets killed - you know they are going to use self defense. So you must have evidence that it wasn't . Please cite any evidence that it wasn't. You can't. You have got to prove it beyond a reasonable doubt. Something like a witness, or physical evidence.
Forget the character of these two - seems like they both have issues - but how would you DISPROVE what Zimmerman said happened? I have yet to hear that. Be honest, with no new evidence, they decided to charge him for political reasons months later. That's just not how it works. When they have a good case, they charge rapidly, or when they get new evidence.