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.
It may depends on where in the US you're talking about, but in my area none of this is actually true. Although lots of people believe it is.
I agree with you that the risk of being killed by a car is somewhat low though.
The US is huge, and incredibly diverse. I have no doubt that there are places where the sorts of things being reported here happen. I know for a fact, though, that there are many places where such things are unheard of.
As a rule of thumb, any time someone says "this is how it is in the US", they're probably wrong. It may be how it is in some parts of the US, but there are few things that are actually universal here.