You are basing your opinion on media related 'facts', and those are unreliable. It biases your outlook.
THINK of what the circumstances could have been if Zimmerman had stayed in his truck and NOT followed Martin.
The police would have shown up, they would have walked around the grounds, and we wouldn't even be talking about this.
Zimmerman's lawyers are going to have to prove somehow, someway, that Zimmerman was not the instigator.
Would you punch then knock down someone for watching, following, or questioning you then bounce their skull into the sidewalk? How can that be justified? Martin feared Zimmerman was on the phone with the police. What was he so afraid of if he was just on a ‘Skittle’ run?