Earlier quoted context omitted.
Is this backed empirically? The argument you made is almost identical to the ones used for "grand theft auto is making kids violent!".
There's no reason to make such material lawful unless the converse is proved by empirical evidence. That is, can it be proved that people who view AI-based material are less likely to act on a sexual interest in real children? Unless that's proven, there's no other reason to make such material lawful. You're welcome to provide one. The analogy is not apt. You cannot compare image-based abuse of children with a video…
You can generate whatever you want on your own PC, but if you try to use it for fraud or to share illegal material then you are a criminal.