*Membership spots not really limited!
Who says Zimmerman was going to get murdered? He had some minor scrapes. He put himself in a position to cause a confrontation. He was told on the phone to back off and didn't. He brought a gun on the street and initiated a confrontation, Martin didn't.
I'd say the same thing if Zimmerman was black and Martin was white. Last time I checked being a vigalante was illegal. Have a problem, call the police and back off.
What if Zimmerman was Batman?