Where do the children play?

As a society we find violence or harm against children to be extremely shocking and tragic. As a society we would do almost anything to prevent it.

Giving children the kinds of freedoms discussed in this article would lead to some harm coming to them. Accidents, violence, kidnap, etc.

Therefore, society won't give them those freedoms.

This tendency has been exagerated by mass media in the modern era. Every single case, every piece of anecdata, makes massive headlines and instills the fear into parents everywhere.

It's impossible for society to reverse course because that would mean acknowledging, implicitly or explicitly, that some level of harm for some children is justified by the developmental benefits to all children of increased freedom.