As well as creeping scope from non-porn people, there are pleanty of anti-porn and anti-sex campaigners out there. They want to ban all porn. They'll talk about extreme porn and simulated rape porn and child porn now. Then they'll talk about default-on filters, then people/polticians/etc. will be pressured into always having it on, etc etc.

Remember there have been court cases about whether contraceptives, pornography or abortion was legal. There are people who want to go back to the "good old days" when condoms, porn and sex outside marriage was illegal.