I wrote a long winded thing about my personal experience but deleted it because it was too personal and too depressing to think about.
The summary is that the risk of a CPS investigation of a kid playing or walking independently is probably 10-100x that of suffering a car accident. And the average car accident is way less traumatic than being ripped away from your family, tossed in a foster home, and feeling like your parents have abandoned you forever because they could not protect you from the state.
That's terrible.
What's the solution though? Stop letting kids play outside? I think the solution should be to reform CPS so it's not so traumatizing, and have more governmental awareness campaigns of the benefits of kids playing outside. I see government billboards all the time about anti-smoking, eating healthy, prediabetes screening. There can similarly be billboards promoting kids playing outside.