Look at the way our cities are built. I live in a grid based streetcar suburb and my kids can be let out feral. If you live in a modern subdivision ... Good luck. The roads are too big, and there is nowhere for kids to go. Meanwhile, my local city has free lunch at the park for kids every day during the summer and kids can go unaccompanied. I see tons of kids out riding bikes and walking by themselves.
Impossible in modern developments. You'd have to cross a six lane road with 50mph traffic to get anywhere not safe.
Agreed, the consequences of a car-dependent society are far reaching, and this is a very insidious one.
I'd also add that it may even be illegal in some places to let your kids outside by themselves at all. Even when it's not illegal, it just takes one busybody to call the police and you've got a potential charge waiting for you, all because you let your kid walk a couple blocks to school. And of course, this just exacerbates the problem further.
Impossible in modern developments. You'd have to cross a six lane road with 50mph traffic to get anywhere not safe.