Originally Posted by BroncoInferno
Because, as he states in the 9-11 call on the night in question, "these a-holes they always get away." No doubt thinking of the previous occasions where his calls were for naught. On that night, he decided to take matters into his own hands.
That's an assumption. We don't know who instigated the physical conflict. Zimmerman's testimony is that he lost Martin and was returning to his car when he was attacked. The police saw no evidence to the contrary.
On that call he also said, "We've had some break-ins in my neighborhood, and there's a real suspicious guy." Then he said the guy was "just walking around looking about" in the rain and then said, "This guy looks like he is up to no good or he is on drugs or something."
I watch the video of Martin at the store and think the same thing. Look how long it takes him to get the money out of his pocket? Watch the body language of the store clerk.