I've got no problem with GZ being on the neighborhood watch, and calling the police on TM given the rash of crime in the neighborhood. Again, this really comes down to people believing that GZ is a racist vigilante who (1) racially profiled TM, and (2) intentionally approached TM and instigated a fight. I see no convincing evidence of either.
And legally speaking, I agree he should walk based on lack of evidence but (FL) juries have done crazier things.