If you want good evidence that this is hard to study well, even if you maintain that political concerns are a non-issue, around 11% of men report some agreement with the statement, "I am addicted to pornography." https://pmc.ncbi.nlm.nih.gov/articles/PMC7044607 Of course, another analysis found that just 51.7% of men used pornography, which seems optimistically low: https://pmc.ncbi.nlm.nih.gov/articles/PMC11234758/ See the concerns I mentioned around getting truthful data, which are also well-known within nutrition. 17.4% of those men were "problematic" pornography users.
I'm back on a laptop now so can pull this up a little easier, but I don't think you're defending this from the right angle. It's the same as when the marijuana legalization advocates say "it's basically medicine lol" or deny that addiction is possible and that it's known to somewhat increase risk of schizophrenia, because they are scared that admitting that something is bad means they are somehow supporting a ban on it. There are a lot of bad things people consume and I support banning very few of those. Pornography is not one. Please don't mistake my position.
I'll also point out that my original comment explicitly stated that I didn't see it as the role of the state but of parents. I'm not sure with whom you're arguing here about that.