When a 140 pound kid attacks a 250 pound older man (and isn't high on meth), it could be because the kid feared this guy who has been following him and is carrying a gun.

Comes now all the stories about Martin being expelled from school, having an empty baggie in his backpack that tests positive for trace MJ are all irrelevant in a court of law, but plays well in the court of public opinion. Assuming Martin was the scumbag Zimmerman's supporters are trying to make him out as, Zimmerman had no excuse to shoot Martin. Even Martin attacking Zimmerman doesn't excuse Zimmerman given that an armed Zimmerman was acting suspicious by following Martin around keeping tabs on him.