Downloading and possession of CSAM seems to be a common first step in a person initiating communication with a minor with the intent to meet up and abuse them. I’ve read many articles over the years about men getting arrested for trying to meet up with minors, and one thing that shows up pretty often in these articles is the perpetrator admitting to downloading CSAM for years until deciding the fantasy wasn’t enough anymore. They become comfortable enough with it that it loses its taboo and they feel emboldened to take the next step.
CSAM possession is illegal because possession directly supports creation, and creation is inherently abusive and exploitative of real people, and generating it from a model that was trained on non-abusive content probably isn’t exploitative, but there’s a legitimate question as to whether we as a society decide it’s associated closely enough with real world harms that it should be banned.
Not an easy question for sure, and it’s one that deserves to be answered using empirical data, but I imagine the vast majority of Americans would flatly reject a nuanced view on this issue.