I hear what you saying but on the face of it, a self appointed armed policeman without the requisite training nor the desire to listen to supervision, making rounds and pursuing “suspects” is not advisable behavior.
The odd thing about the case is that no one mentions that Zimmerman is a Latino, because it defeats the propaganda value.
He was not required to obey the instructions of the 911 dsipatcher. What Zimmerman did was not illegal, any more than the young man being in and walking around the neighborhood was illegal, where apparently family of his lived.
The key thing is the violence and altercation. Apparently Zimmerman gave up the chase and was walking back when he was attacked by this young man...who was getting the better of him and pummeling him.
At that point Zimmerman had every right to defend himself. Apparently, it was Zimmerman crying out for help on the tape.
If the young man initiated violence, it was illegal and irrespective of stand your ground, Zimmerman was entitled to defend himself. That decision to use violence was initiated by the young man...apparently.
But we have to let the facts come out and that is the real issue IMHO. Let the process work...we have a President and others immediately politicising it and convicting Zimmerman before he has a chance to defend himself or have due process.