This is obviously preposterous, and there is basically no chance of it lasting or being significantly effective.

I am pretty curious though about what approach to safeguarding children might be effective – or indeed, if research suggests that it's required. It does seem reasonable that freely available pornography at a young age could have substantial effects on sexual and social development; before slamming into full-blown 'moral panic' mode, it might be good to know what those effects are.