> This is alarmingly incorrect. Extra curricular activities, clubs, sports, and music work exceptionally well at keeping kids too busy to indulge in pornography or other unacceptable habits like drugs.

Ha ha, if only.

You're forgetting the liminal space - the transition periods. Unless you're going to personally hand your kid off to a teacher and then pick them up afterwards, exactly on the minute the activities start and end, leaving exactly zero time for them to interact with other kids with little supervision, kids will find a way.

And if you actually manage to do that, you'll be severely damaging their social development, hindering their ability to function in society as independent adult, possibly for life. This is arguably much, much worse than them smoking a few cigarettes and watching some porn.