I think that's way too much of a generalization when it comes to SJW, especially saying they consider almost everything rape, SJW, feminists and so on can be all over the place in their belief
Also, I think biggest difference between them is size, like, don't get me wrong, there's absolute quite a few people on the left that are definitely against porn and want to censor a lot of stuff, SWJ, feminists, whatever you call them, some extremely vocal but for the most part they're a minority and most people don't agree with them
Conservatives though? They don't need to be puritans to be against porn, they have infinitely bigger number of people who would get rid of porn if they could, SJW and such gets nowhere close in size, cue stuff like entire red states trying to get rid of porn and most of their voters agreeing with it, like Texas
The fact is that any group in the left who actually wants to get rid of porn and such are a small minority that they're utterly powerless, while conservatives are still to this day fighting a decades long battle to try get rid of porn, only failing because anything too drastic would fail in front of the Supreme Court
It's easier for conservatives to be more against this in numbers because they use religion to justify it, they have to be against it, period, that's true for many issues, people on the left don't have such excuse so as a group they're more fractured and all over the place, cue the more extreme SJW and feminists being a powerless vocal minority against porn while many others can still be SJW or feminist and not have issues with porn
Politics can get weird with how people get divided in some issues :v
Unfortunately, this whole conversation is off-topic and has a high chance of being deleted (every post that is about it)
Outside of porn, it's been leftists censoring everything recently (past 10-15+ years or so). It's mostly been targeted towards games/animes made in japan, it's been censorship in the typical fashion, censoring characters, censoring scenes, censoring violence, etc etc.
You also have the censorship that's been going on since 1998 or earlier, because the earliest example I can think of are the first pokemon games, the localization is terrible and censored to oblivion. I believe some characters/sprites may be as well.
We just didn't notice it, because we were used to w/e english versions we got back then, we thought that's how the game/anime was, but ever since a certain year, we've had the tools to communicate in the video game and anime community to share vast differences in localization, and changes or removal of scenes/things in games and anime.
You had tons of people that knew japanese and english, able to understand both, and compare these games and anime (mostly games) side by side. I know the moment I found out about this I was pissed, it's still going on nowadays, and it's a group of leftists in the localization industry for games and anime, purposely botching a game/anime's translation, and thinking they know better than the original author. (the joke that has been made is that they're failed writers, and can't come up with their own idea/s, because they're crap, so they sabotage existing franchises)
Then you have this push for D.E.I. , they've been purposely making women characters ugly, they always have these checkboxes of things not just women characters have but characters in general have, male characters seem a lot more androgynous, and you have tons more "inclusive" things in these games/anime, mostly games for D.E.I.
There are several examples of this over the years, but way too many people seem to take the usual stance of "it's not that big of a deal" and just want "fun" and "good" anime//games.
Yes, I agree those are important, but I also don't want my animes/games to be messed with in any way, I want them to be as close to the original as possible, in translation, and in non-censorship. It's why I've stopped supporting tons of companies and skipped out on tons of games. I have outright completely stopped supporting any game said company makes.
This also extends to a series being changed for both sides aka globally/internationally, games and anime should remain apolitical, and avoid any kinds of these issues/topics, unless it somehow comes into play for the story of the game/anime.
Tldr; It's both sides, not just extreme conservatives, or as they were more known back in the 90's to 2000's+, puritans.