You could make same exact argument regarding kids health, alcohol abuse, nicotine abuse, all types of addictions, age of consent, and so on.
You can't just have all the safeguards dropped because you think you're doing a good job. Or, even worse, you have no kids and it's your virtues merely projecting.
From both someone involved in raising kids as well as someone who knows a lot of teachers: none of the involved parties want that. Schools are at best for teaching, but never for raising.
Is it the sole responsibility of a school to ensure well raised (for whichever specific definition of “well”) children? No. However, they are a large factor in the raising of children.
We’ve had a live experiment with this during COVID and it’s pretty clear that kids raised solely at home by their parents fared way worse. Not just on academic metrics, but basic conflict resolution or social skills.
Don't let kids have an internet-connected phone, the same way they can't have a bottle of wine.
If they really need such device make sure that device is locked to a small list of app/contacts possible.
There's no need to lock down the rest of the internet because the responsible person of such kid can't tolerate their complaints. It is a parenting issue.
I have seen religious parents been vocally opposed to their children seeing or even discussing anything related to sexuality.
An example from the past:
"The National Legion of Decency, also known as the Catholic Legion of Decency, was an American Catholic group founded in 1934 by the Archbishop of Cincinnati, John T. McNicholas, as an organization dedicated to identifying objectionable content in motion pictures on behalf of Catholic audiences."
https://en.wikipedia.org/wiki/Legion_of_Decency
https://www.archbalt.org/catholicism-influenced-moviemaking-...
Unless your point was that we should legally ban kids from handling phones, which I think is too extreme.
Chase the responsible adult if you see a kid with an overpowered phone, much like you would if you found the same kid with a bottle of wine.
And granted, we don't have locked-enough phone in market yet, but that's a solvable problem if we were to create that market.
"It takes a village to raise a child." Except these same parents who won't take care of their kids are also the very first who go all "How dare you speak to my child like that! I'm going to have you fired!"
The saying is about kids watching and learning from their environment - from how adults act. If you set up to be jerk or take advantage of random kids that happen to be around, you are teaching them to take advantage of people. And no amount of yelling "their parents are responsible because they did not stopped me" is going to change that.