@snood,
Good thing you don't have a son.
The fact that Zimmerman had a gun and was willing to use it is precisely why a father should hope his son would refrain from pointless displays of machismo, and turn around and walk away.
If the right thing to do was to beat the snot out of Zimmerman, then Martin's death would have been heroic, not tragic. As weird as this thing has become, I've yet to see anyone describe Martin as a hero.
The minute you engage in violence, notions of fair play become meaningless and expectations for them become idiotic.
Fortunately, killing someone is difficult for even someone perceived to be a bad ass, or else there would be a lot more dead people filling up cemeteries. Nevertheless, there are those who can kill and actually enjoy doing so and you never know whether or not the loudmouth you clock is one of them.
If Zimmerman didn't have a gun and wasn't prepared to use it, Martin would likely have returned home boasting to all his friends that he had beat the snot out of some racist cracker. Apparently, if you were his Dad he would have gotten an Atta Boy.
Being a male, he would have been high as a kite on his primal victory, and unaware of just how close he came to losing his masculine life. Such is the life of testosterone flushed teenagers but one would hope the adults in his life would contribute reason, not encouragement.
Violence is often necessary and often just, but violence to validate masculine pride is absurd for a species that has developed weapons and a thirst, among some, for blood.
I am the father of two sons and I would much prefer to talk to them about how they felt shame about walking away then attending their funerals.