Trayvon Martin's champions should be careful what they say about the "stand your ground" law. It's possible that Martin felt threatened by George Zimmerman and, in fear for his life, countered the threat rather than retreat.  Of course Martin had no gun, but what if he had managed to kill Zimmerman by, say, slamming his head on the pavement? He might have reasonably invoked "stand your ground."

Be careful.