And I consider myself relatively lucky in that part of the US where I live, despite being in a relatively rural region, is remarkably walkable. As opposed to most places in the US, which are effectively micro islands when it comes to getting anywhere on foot.
Then lets also add on how loitering is treated as such a great offense. That traditional areas for young adults to just "hang" (cafe, bowling alley, arcade) have increasingly priced them out. That a teenager hanging out on their own is often suspected to be "up to something"
In a time before the cell phone, we apparently let kids wander unsupervised more than we do in an era where they can get a hold of their parents at almost any time? It's ludicrous.