Possession is one thing, exposure is another.
But I see your point, and the inherent lunacy in controlling peoples’ morality- and the ethical quagmire morality, legality and practicality entails when one attempts to distill a single, over-arching rule.
I’m fine with hate-speech, etc. being punishable when originating within one’s own borders. I do not agree with restricting access to it in general. (and thus maybe pretending it does not exist in the world)
As for rape porn: It’s not my cup of tea. But damn it, if it’s role-playing between consenting adults, I can’t really see why it should be illegal. It’s not like keeping it legal will make producers of it put up large billboards and show it on BBC every Monday morning.
It’s not about porn. It about letting others dictate a specific, perhaps even arbitrary, set of morals upon a population.
EDIT:
I don’t meant to seem ornery, even though my tone might suggest it:)