> lack of time for parenting

The average father in present day spends more time with their kids weekly than the average mother did in 1960.

> helicopter parenting caused by breakdown of social trust

This one is more likely I think. Kids aren't able to just run around anymore.

> lack of infrastructure and provision of environments where children can be known safe in public

Kids can not safely ride their bikes a few miles across town. Fewer sidewalks, bigger cars. Distracted drivers. Its a death sentence.