This comes up in every thread about this case. Look at the entire sequence of events:
1) Trayvon is walking back to the house he was visiting (a friend of his fathers).
2) Zimmerman spots Trayvon and thinks he looks suspicious, so he begins to follow him in his car, and calls the police.
3) During the phone call with the 911 dispatcher, Zimmerman notes that Trayvon notices him following him, and takes off running.
4) Zimmerman then proceeds to follow Martin on foot.
5) At some point during the ending of Zimmerman's call with the police, and Trayvon's call with his friend/girlfriend, an altercation breaks out, and Zimmerman shoots Martin.
Now, re-read event number 3. According to Zimmerman's own words, Trayvon fled. Does that sound like the actions of someone who was actively looking for trouble? Someone who was looking to get into an altercation with a stranger. He ran away. He tried to remove himself from the situation of being followed by a stranger in a vehicle, and Zimmerman pursued him.
Now, I can't speak to what anyone but myself would have done, but in a similar situation, I would have done the same thing: picked up my walking speed, and if still being followed, outright run away.
Also, contrary to popular belief, most people aren't keen on opening their doors or answering a call from a stranger, and in this country, especially a black male ringing their doorbell or knocking on their door in a panic.
As a young black man, we are taught, at an early age, to behave a certain way so as to not draw attention to ourselves in a way that will make white people uncomfortable. We are also taught not to bang on stranger's doors on a rainy night.
Martin was killed not very far from where he was staying. He probably assumed he'd lose the guy following him, and go home. No need to panic neighbors.
Unfortunately, he was followed, and more than likely, felt threatened by, well, threatening behavior, and tried to defend himself. Unfortunately, Zimmerman had a gun, and like Rock, Paper, Scissors, Gun beats Fist.
Having been on the receiving end of having a stranger follow me, I know what that adrenaline rush and uncomfortableness feels like. I'm not saying I would have started a fight, but I'd have prepared myself to fight. For my life if need be. We're taught to be wary of strangers. Strangers following you in vehicles even moreso. It's simply better to err on the side of caution, even when it turns out that that person just happened to be walking the same way as you.
And with that, I'm done with this stuff for a bit. After the previous two Zimmerman threads, I've already said everything I can possibly say about this case, and it's not really worth the headache repeating myself a few hundred more times.