Sure, but the media can only scare people if they can imagine it being true. It's a lot easier to imagine someone who would do their children harm actually going through with it and succeeding when the kids are wondering around suburban cul-de-sac hell where the only other people are zooming past in a car.

EDIT: I'd like to add that the urban design also changes how people deal with this fear. For example, in Japan it's common for elementary schoolers to have a buzzer on them with a cord to pull in case of stranger danger. So clearly this fear exists there too, but you still see kids going around town without adult supervision. The reason why the buzzer can give peace of mind is because they can pretty much count on there always being people close by enough to hear the buzzer go off.