Recently in the U.S. news a parent was convicted of murder because they facilitated making weapons to their child who then committed a school shooting. They didn't give their child weapons and tell them to go do it, they just didn't keep them away. This is a good trend that I hope continues and will actually help prevent school shootings. Parents are responsible for their children. If children are frying their brains due to Internet exposure, similarly it's the parents fault, and they should be held liable for child abuse in the same manner as if they committed other negligence.
Someone at school has parents who aren't watching their children and allowing them unrestricted Internet access? This is where the bounty-hunter private-right-of-action morality-police laws that seem to be gaining traction can be put to some actual good use instead of, for example, hunting down trans people in Kansas. If someone's child is showing other children inappropriate material because their parents are negligent, the other parents should be able to take those parents to court and recover damages if they can collect evidence. Once parents are fined for letting their children roam with an unrestricted Internet connection it'll stop pretty quick.
> they need help from the wider society they live in.
Help that is not material support (e.g. paying hospital bills, babysitting, etc.) is usually interference.
> I think it's pretty self evident to everyone here how bad internet can be for the mental health even of adults
Agreed, but I can handle myself on the internet (my parents did their job and I am also not a dog and know the difference between a screen and a real object), and shouldn't be tracked with verification nonsense because someone else can't.