Rob,
When police are called to the scene of a fight and it's one persons word against another, and one person is not a scratch on him and the other person has a bloody nose & bleeding back of head then 99.9999% of the time the police will arrest the UNINJURED person since they the evidence indicates they dished out the beating. It does not matter who said who started it.
You're smarted than this.
I think when ONE of the people has a gun, everything changes.
I think with recorded evidence of one person angry, and pursuing, and the other running to get away...
Not even getting into Zimm's record with assault on LEO, domestic abuse, the perverted shit, and whatever else... I mean, trayvon was a dumb kid posing with a glock and using pot... Zimmerman was running thru yards with a 9mm because he wanted to handle justice before the police arrived. Zimm's a much bigger danger to society (if we want to talk about trayvon being a thug, as others have)