My neighborhood watch would have brought charges against Zimmerman in fact. The whole point is to “watch”, not “act” and this dude was hunting.
Same for your claim that Martin was justified in beating Zimmerman under "stand your ground". He wasn't. "Stand your ground" means you have a legal right to be somewhere and that you are under direct threat. Once Zimmerman was walking away from him, as at least one witness reportedly stated, Martin had no right to jump him.
You lose again.