I don't even think it's about preventing the act themselves, it's more an attempt to sanitize the media they like, so when the censorship they're championing finally arrives, THEIR media will be exempt, and they'll be free to punish others for their incorrect tastes.
Genuinely feel like a lot of the aversion against dark or taboo topics being depicted in stories comes from a belief that you can prevent these bad things from happening if you server the root of these bad things but misunderstand that the root isn’t fiction, it’s humans