CP should be removed at the source, by doing everything we can to take care of kids and preventing abuse and related photography. And CP trading rings should be busted.
But individual pedophiles should be helped with their mental health issues before they act and become pederasts. The subject is so toxic that nobody dares go to a therapist with their issues. There was a recent documentary about it: https://www.idfa.nl/en/film/bb3cd43c-169a-48db-9fd6-e4cbae0d...
Coming back to crypto. Who cares if the images are shared using crypto or on paper or on usb sticks? Once you find a pederast, law enforcement should convince (without torture or similar tricks, offering therapy and help will probably be more effective) them to help expose their network. Same with any activity that is using encrypted communications: https://edri.org/files/encryption/workarounds_edriposition_2...