re:Zimmerman acted in contradiction to what the police dispatcher advised him, and in violation of the rules of the neighborhood watch program with which he claims to be affiliated.
As pertaining to the watch program:
http://www.npr.org/2012/03/21/149086792/shooting-renews-debate-on-vigilance-vs-action
"Although
Mr. Zimmerman apparently was not part of any official neighborhood watch organization, even if he had been, these folks don't have any more power than ordinary citizens," says Paul Butler, a law professor at George Washington University. "They are not law enforcement officials."
About 25,000 watch groups are registered with the sheriffs' association, which started its neighborhood watch program in 1972. Many other groups are registered with local law enforcement.
In a statement this week, the sheriffs' association referred to Zimmerman as a "self-appointed neighborhood watchman," and said it had
no record that his community had ever officially registered a neighborhood watch. So it is unclear whether he would have been familiar with the NSA's guidelines.