There are such folks ~ they aren't all nice guys.
There was some discussion today of OTHER MURDERS that followed this same pattern in that area, so there may be a lot more going on here than we know about at this time.
Oh please. Compared to the surrounding communities Sanford is murder central. There isn't anything "more" going on here other than a crappy part of town being under the spotlight.
The fact that there are no eyewitnesses and that Zimmerman has injuries for which he is claiming self-defense is why he is not in jail. The law is working the way it's supposed to. If the state or the feds wish to pursue Zimmerman with the existing evidence for a show trial, fine, let them pay for it.