According to the few studies we have in the nineties and aughts most people who have sexual attractions to kids are aware acting on them can be harmful and will turn to alternative ways to explore them (when they can’t be suppressed or redirected.) So yes, now we have victimless ways to produce porn, the objections are to the fetishes themselves, not to resulting violent behavior.

That said people commonly and openly express their distaste for such people, more so than domestic violence offenders who assault their kids, just not sexually. The same general disdain for child-sex-attracted adults does not transfer to action to feed children or protect them from abusive households.

That said, when we’ve worried about fiction driving people to act it out in reality, historically this has been demonstrated wrong every single time. Women are not driven to scandal and harlot behavior from trashy romance. Teens are not driven to violence from violent movies or video games. We can expect porn featuring childreb is not going to compell someone to seek to actually sex-assault kids.