I am very much pro-free range kids, but the potential consequences can be catastrophic.
Calls to the police and cos are a very real thing. Parents regularly get in big trouble for the kinds of things that used to be common- leaving my almost 7 year old in the car while I ran into a store for an errand could easily result in a call to cps/police. In my opinion, my 7 year old is fine in a car (not worried about abduction or wandering off so I can easily leave windows down for temperature concerns) and frankly he is probably old enough to go into the store himself and do the errand, but god knows if I did that, someone would freak the f out.
Same with playing in the neighborhood. None of the other kids are allowed to wander far, and when they go out their parents are typically out with them. The concept doesn't really work unless the other kids are out playing too.
So yes, there are plenty of parents who do value these things, and are trying to achieve them, but it's an uphill battle, and all it takes is one over zealous safety crazed person to make a call to cps/police, and I might have my kids taken away. Suddenly it doesn't seem like free-ranging my kids is the top priority.