Some are defending George Zimmerman claiming he shot Treyvon Martin in self-defense and that his action was covered by Florida's "Shoot First" law.
Let's look at another way. Treyvon Martin felt threatened by George Zimmerman who was stalking him. Eventually Treyvon Martin "pushed first" in self-defense. Zimmerman and Martin may even have had a shoving match. Eventually Zimmerman fell down, pulled his gun, and fatally shot Zimmerman.
Under the old rules, Martin might have been guilty of starting the fight. Given the new rules, he was acting in self-defense and pushed first.
Now, what if Martin was a neighborhood watchman in his own neighborhood? He saw a suspicious white person looking at house addresses. What if he acted exactly as Zimmerman had acted? Would Martin be considered as acting in self-defense or would he be considered as committing a murder?
As with all violent actions, we can only speculate on all the possible causes and results.