Comment by bedobi

The design of the physical environment is in no small part responsible for this. Don't believe me go to Europe and Japan where kids are still allowed to walk and bike to school, to friends places and just in general play and exist outside unattended to a much higher degree than in the US. Because in the US they would be roadkill, and even if they somehow survived outside of a car, car centric design means there's nowhere for them to go on foot or by bike anyway. Everything is too far.