Porn seems to have heavily reduced rapes. Thing is porn was something applied to the everyman. IE healthy normal individuals. CP however, really only ever is sought out by people w/ an obvious screw loose. A healthy man should want to find a woman who is capable of having children, something is wrong for that to be warped.

So the question is; would open access reduce incident(rape) for people who are ill(pedos)? From what I can gather on statistics(5 minutes or searching, so not too concrete), the rate of child sexual abuse hasn't been going down DESPITE an explosion of access to CP for anyone who really wants to seek it out.(darkweb, torrents, apparently a fucking creepy pedo wank scene on facebook).

The rate hasn't been going up either, so MAYBE you could justify that there'd be no new victims, but that's suspect, and I'd think 99% of people would say the slippery slope is not a fallacy here. At least I hope to God it'd be 99% of people