> You can configure parental controls or take away the phone.

Your first suggestion was silly, so now you have pivoted to telling me another way to parent. All the while have zero experience of your own. Did you know that social media is accessible on devices other than personal phones? Kids use computers and tablets at school (as early as 1st grade) with access to the internet.

> Yes, of course!

Which is my entire point. Parents, on the other hand, have to worry about people other than themselves.

> They protect me by discouraging other people from committing violence on me, obviously.

Now you are outsourcing your personal protection to the government. I have to pay extra because you can't defend yourself. You took on the responsibility of protecting yourself by being born.

> Cost/benefit for me

We get it, you don't care about anyone else. Things that help you are good, things that inconvenience you are a product of other people's errors. Nothing more really needs to be said.