This is addressed to no one specifically but to everyone, generally.
There seems to be a mistaken idea that only the police can deal with crime and criminals. Americans, for a large part, seem to put all the burden of a civil society on the police, and then complain when they either don't respond quickly and often enough, or become too powerful and intrusive. Yet, we're the ones who surrender our authority to them, and sit around like helpless children when something goes wrong.
Folks, it is not illegal to check on suspicious activities in your neighborhood, as long as you either stay on your own property, common property (streets, sidewalks, easements), or the property of a neighbor with whom you have an understanding (for example, we looked after the property of our elderly next-door neighbors).
That doesn't mean you can't call the police--you should. But don't depend so much on them. They aren't infallible.
I doubt very much that TCS or I would have taken the same action as Zimmerman, even if we were armed. We would probably observe where he went from our vehicle and call it in to the police. We would stay in the car but keep an eye on him, and keep the police informed. BTW, we have had similar break ins in our neighborhood, by teenagers, who got away. Almost the same scenario. Our neighborhood FB community spread the word, and kept us informed. They also asked us to be on the look out for the teens, and they gave a description of them. That is not profiling.