Yet learning how to cross the street is an essential skill in life. They are also filled with flowers, pathways to playgrounds and much more. And that's why children are not forbidden on the streets.
My point being: let's educate instead of regulate. "Regulating the children" is silly and countereffective.
Is it the knife that kills or person doing the stabbing? Or the knife maker? Can the knife be taken to court?
Is it $website allowing the children on it or the parents allowing them? Can the parents be taken to court?