Wow. Ten years old. That's a tough age. My daughter is still much younger than that. If I was in your situation, I don't know what I would do either.

This thought is just from me, not KaBOOM! Is your neighborhood playground near you? If it's in a relatively small area, you might be able to do something to get to know your neighbors a bit better. If you've got others keeping an eye on you and yours, you might feel better about giving your son some more leeway. Maybe organize a neighborhood watch group that, among other things, keeps an eye on the kids in the neighborhood.

I'm sure you aren't alone in your concerns. I'm sure there are others in your neighborhood with the same concerns.