ETA relevant links: https://youtube.com/@NotJustBikes https://letgrow.org/
ETA again: I glibly mentioned "being killed by a driver" but of course navigating the typical US built environment if you're under 16 or otherwise unable to drive is a miserable experience in a number of ways even if you survive it. Highways make pedestrian paths unnecessarily roundabout. Parking lots make everything further from everything else. Crossing major roads requires getting drivers to notice and stop for you (harder when you're short!), or waiting through interminable signal cycles, etc.
In 1.5 years living here, we've had the cops called on us once when we let our 7 year old walk 2 blocks to her friend's house unescorted. We also have to deal with the muscle cars and loud motorcycles which whizz by our house at 3 am each Saturday evening. We also know our neighbors who are of all ages and walks of life and there is never a moment we are fearful for our children's safety.
Please try embracing the opposite view. College campuses in the US are not an aberration, but rather an example of what community could look like.