Acquiring child porn doesn't have to be any more difficult than acquiring videos of beheadings and other vile acts. It was only made difficult to acquire out of puritanism, there's nothing intrinsic about it that suggests you have to commit further crimes to find it.

And if the idea is that the public is too dumb and easy to influence and therefore cannot be shown child porn or killings in New Zeland etc then it doesn't make sense at the same time for me to be advertised violent movies in the cinema.