Not just "stranger danger", but fewer people (in the US, and AIUI increasingly other parts of the developed world) live in a place where you can do anything wit

Not just "stranger danger", but fewer people (in the US, and AIUI increasingly other parts of the developed world) live in a place where you can do anything without driving. As a result, not only are children barred from operating independently of their parents' time, but everyone is more sedentary, by nature of replacing active travel with automotive travel at every opportunity.