Zimmerman had called the police. They told him not to follow Trayvon. If at that moment he would have got back into his vehicle and left he would have had no reason to use his weapon.
As I said you don’t go looking for trouble as it may find you.
If you have a concealed weapons permit you shouldn’t go around looking for the opportunity to shoot someone or even appear to be doing that. The law frowns on vigilantes.
Be aware you can do everything right and use your legally concealed handgun to defend yourself from an attacker who intends to murder you and still end up facing some gung-ho prosecutor. You will likely go bankrupt and you may end up in prison. Also even cops who legitimately shoot someone often suffer psychological problems from the incident. You may also and if so you may end up adding a psychiatrist’s fees to the amount of money you owe.
From the title you can tell the following article is biased but it does show the problems Zimmerman has had since he encountered Trayvon.
A List of George Zimmerman's Arrests and ongoing legal troubles he's had since getting away with the murder of Trayvon Martin.
www.einvestigator.com