It's hard to take these kinds of rationalizations seriously. Simply, most people in our society find this sort of pornography revolting, and the law, which reflects public outrage, has banned it. We didn't reach that outrage from evidential reasoning. Moral revulsion is an irreducible position, and it's not subject to dispute. Likewise, we've never had a rigorous experiment to test whether murder should be illegal or not. That isn't how laws get made.
When the topic of child porn comes up, emotion takes over and logic goes away.
One of the largest problems with child porn is the actual definition of child porn. To most people when they hear of child porn, they think of a Person under the age of puberty being forced to engage in a sex act with an adult person.
However 2 17 year olds having sex and video taping it is also child porn, they can (and have been) charged with producing, and distributing said child porn
Many many many teens were arrested and convicted before states starting passing exceptions to the law, and many states today it is still illegal for a 17year old person to send a nude photo of themselves to another 17year old person, haven forbid a 17 year and 364 day old person send picture to a 17 year and 366 day year old person....
Do you know that every image on this server was the "raping 8-year-olds" kind. Did you personally examine every image?
Where are you trying to go with this rhetorical question?
Nobody visits a darknet site called "The Playpen" to trade pics of consenting 17-year-olds. For all you or I know, the site never existed in the first place and the FBI set up the entire thing as a cover to silence dissidents. But that would be a problem with government corruption, not with the definition of child porn.