@ "what about the children harmed in production?"
There is already a solution to that problem, or, at least, there was until the last Government in their final desperate attempts to grab votes in their "Won't Someone Think Of The Children" campaign put the kybosh on it by introducing the "Dangerous Drawings" Act whereby a complete fictitious drawing (ie not taken from life or a photograph of actual abuse) or even a 3d rendering of something that looks like a child became illegal.
Of course this was just another stupid and unenforceable law (like the Dangerous Pictures Act outlawing so-called Extreme Porn) but it made for good headlines in the tabloids.
The "Porn Causes Rape" arguments have long been shown to be fallacious, but they keep getting repeated by those whose real position is "I don't like this, so *you* shouldn't be allowed to see it", indeed some campaigners are still trying to cite Donnerstein who thought he'd shown a link between porn and violence towards women but then subsequently withdrew his findings when he found that the same results could be achieved by getting subjects to ride an exercise bike for 10 minutes (should be ban exercise bikes, then?!)
It is good to see that Anthony D'Amato's results back up the findings of Milton Diamond PhD of the University of Hawai'i who also found that an increase in the availability of pornography lead to a reduction in sexual offences (including those with children as victims):
"It is certainly clear from the data reviewed, and the new data and analysis presented, that a massive increase in available pornography in Japan, the United States and elsewhere has been correlated with a dramatic decrease in sexual crimes and most so among youngsters as perpetrators or victims."
Of course this will be most unlikely to persuade the current administration to reverse the Dangerous Drawings Act in the near future because the Tabloids would love to jump up and shout "Coalition Promotes Kiddy Porn" so because of the wilful ignorance of a vocal minority, there will actually be a *greater* risk to children.
Bravo to them.