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Just a guess .. but I get the feeling the 'law' is more to get this in the mind of the parents.

It gives parents tools and guidelines that can help them direct their children.

Whether this is a good approach or not, is a whole other argument.

The legislature is claiming out loud that the law is because parents don’t have the ability to do this on their own.

It also gives the parents an excuse to limit their children.

"I'm not being mean, it's the law."

Anyone who turned on a dome light in a car during the night knows you don't need an actual law on the books to do that