Being a parent is not easy, and fights like these are really difficult. As a human you have only so much fight in you, and if a majority of parents adhere to the same rules this becomes so much easier to enforce.

Government rules set the moral bar, yes they are not enforceable but it creates a standard that most parents will adhere to.

As a dutch parent i wish we had the same rules, my kids are young enough that its easy to ban social media, but its getting harder as they are slowly becoming teenager.