I was looking through the page on the various arguments against OC, and I came across one with a response that didn't quite answer it. This is the reason I generally don't OC, or at least around my neighborhood, and I know the situation is similar for millions of people in the Us.
I live within what you would call a high crime area. PBS even did a show recently on our gangs (and the pop. is 13k.)
One of my concerns with OCing was that due to the presence of a large amount of gang-members is the neighborhood, that they would see me OC, find out where I live, know when and where I work (I am a librarian - easy to find out when I am now home,) and remove the gun from my home.
My fears were rationalized when the guy in the apartment next to mine was arrested for among other things, stealing a gun from a cop's house and using it in a driveby. This was between two shootings that day, and it was apparent that they knew where the gun was, and picked it up when they were going shooting. The fact that these guys learn where houses are that have guns, and then steal them when they need them is for me reason enough to not OC in town, but always CC. I OC out of town.