I find these edge cases extremely implausible, and counter to the way crimes are investigated and prosecuted. "Possessing cocaine is illegal but IMAGINE IF SOMEONE THREW A COCAINE BRICK AT YOU AND YOU CAUGHT IT!!!"
But if you look from another angle - why should cocaine possession be illegal at all? Cocaine seems (to me) to be somewhat less severe drug than, say, alcohol. Same applies to child porn. A lot of stuff qualifies as child porn recently, including stuff originally not meant to be any kind of porn neither produced with any harm to kids. Unless child porn prosecution proponents can limit themself with some strict defini…
Yes, there are cases of things which are not child porn in spirit, however its important to remember that there are things that are actual child porn. There are pictures of young children and toddlers and babies being raped. We don't see them in the mass media, because they are disgusting, but they exist. Don't forget that creating this pictures is probably one of the most horrific and harmful crimes in modern society.