Again, your bringing more ignorance. Dispatchers are not cops nor are they any type of authority. Making a citizens arrest is not illegal itself, which zimmerman has never done, nor did he admit he was going to do, just following from a distance to see where the person was headed too.
What you're justifying is the use of force if someone is reporting you to the authorities and is following you where you are going. Which using force here is illegal. That itself is not self defense, to which the TM crowd is going so far as trying to say.
The fact whether zimmerman was armed or not shouldn't factor in since zimmerman had it concealed, it would be less likely that martin would have been anywhere near zimmerman if zimmerman was brandishing a weapon in plain sight.
In essence you're saying that GZ deserved to be aggressed, when he didn't break the law, and to which citizens in that area followed the same procedure (ex work contractors that followed a suspect from a distance) to help catch a burglar.
This is nothing more than thug worship.