He killed someone, and his series of choices led to that death.
At what point do people start weighing the choices that Zimmerman made against the choices that Martin made?
If you want to get real technical you could look at the choices that Martin's parent's made but I won't go there.
I already posted 5 distinct choices Martin made that lead to his death, the choices he made were also significantly more troublesome then the choices that Zimmerman made.
The poor choices Zimmerman made were?
1) Get out of his car.
2) Not return to his car immediately when dispatch suggested he did not need to follow Martin.
I use the term "poor" here to appease the pro-Martin crowd. If I missed other poor choices he made, feel free to add them, but something like, "He should have yelled at Martin that he was neighborhood Watch" is not acceptable given what we know (and more importantly DON'T know) about the circumstances that night. Also because someone could equally say Martin should have waved and smiled at Zimmerman as he walked past his car, I think it is safe to assume that is not what happened. Zimmerman could have told Martin he was Neighborhood Watch and that might have pissed Martin off even more, nobody knows.
The poor choices Martin made were?
1) Instead of running away and then returning, he should have kept running or even just walked home or called 911 if he was scared, or knock on a neighbors door - take your pick, I'm not penalizing him 3 times here.
2) When Zimmerman started to scream for Help Martin should have stopped.
3) When John Good interjected himself verbally into the altercation Martin should have stopped.
4) When the other neighbor interjected himself verbally into the altercation Martin should have stopped.
5) If Martin saw Zimmerman had a gun, he should have stopped immediately and stood up. Zimmerman said Martin told him he was going to die tonight mother f'r and then slammed his head one more time. You can argue this did not happen, but we also know due to forensics that Martin did not stand up and put his hands in the air.
There were a number of bad decisions Martin made that night, if he makes the right decision for any one of those 5 we wouldn't have a 400+ page thread right now.
You can blame Zimmerman all day long for the decisions he made, but he did nothing illegal and his poor decisions pale in comparison with the poor decisions Martin made that night.