> distribution of child abuse photos legal
That's the problem. So long as there is a channel for distribution of images depicting child sexual exploitation, there will always be someone abusing even more children to produce more material for profit. Widening that channel is opening the figurative floodgates and possibly encouraging a 'dormant' pedophile to act on his/her urges when they normally wouldn't have.
Stopping the distribution of photos of children being raped -> less children being raped so that photos can be distributed for profit.
I'll even argue that legalizing distribution of such images will normalize the behavior in sick individuals. Remember the jailbait/gonewild reddit, and the hoards of neckbeards claiming that there is nothing wrong with looking at suggestive or actually explicitly illegal pictures of underage kids? That was a community in which that kind of disgusting behavior was normalized and encouraged. You could tell that most of them thought it was perfectly fine.
It's ludicrous to suggest that making the distribution of the pictures of children being raped legal is a serious attempt at fighting child abuse.
The 'legalize it' attitude works for the drug argument, where there really isn't a victim from one's choice to consume whatever substance they please.
There is and always will be victims when child pornography is being distributed or produced. Taking a laissez-faire approach just because ALL distribution channels can't be destroyed ignores the real and lasting repercussions the phenomenon has on children.
Edit: I'm still kind of shocked that you are advocating what amounts to a child abuse economy. It isn't the price that is the problem, it is that children are suffering BECAUSE sick individuals feel the need to look at pictures of exploited children.