> Even the idea of prosecuting parents for allowing their child to access 'information,' no matter what that information is, just sounds like asking for 1984-style insanity.

This assumes an absolutist approach to enforcement, which I did not advocate and is not a fundamental part of my proposed solution. In any case, the law already has to make a subjective decision in non-technology areas. It would be no different here. Courts would be able to consider the surrounding context, and over time set precedents for what does and does not cross the bar in a way that society considers acceptable.