Well, i would not go so far as to say 50 shades, if written from the point of view of the rapist, would be written for rapists, but it probably would have a target audience of people who like to imagine themselves as rapists.
Now, not all first person narratives are meant to have the reader insert themselves to the role of the protagonist, some are meant to explore different viewpoints, sometimes rather horrible ones, but other works pretty clearly are, and i would argue that Shield Hero is so heavily favoring the protagonist, on top of the usual power fantasy and isekai tropes, is meant to have Naofumi as someone audience identifies with, and would love to be in the place of.
Flatly, you couldn't write 50 shades from the perspective of the man. The story doesn't work, it's too wrapped up in being the author insert fantasy. The characters aren't fully realized or autonomous outside her. Shifting the perspective would leave giant gaping holes in the story that would have to be written around and thus change the book.
But we have plenty of books for horrible mysoginists. Like Rising of a shield hero. Or Gor.
Now you're wildly over-exaggerating things. I've heard of the Gor series and to say it's feminist in comparison to Shield Hero is way too much.
I mean, the Gor series flat out says that rape and enslaving women is totally alright because the women would end up enjoying it eventually anyway. never mind that they all get traumatized by it at first. Because deep down all women are sluts who love being dominated. Gor teaches us that Rape is perfectly natural, acceptable, etc.
Shield hero on the other hand, clearly seems to state that rape is totally a bad thing otherwise they wouldn't have made such a big deal out of the false accusation. and from what I hear, used it as a punishment for the princess in the LN later on.
Don't let your hatred get in the way of actual facts, please.
I mean... I have read Gor. And, like, I dunno man, shield hero is pretty bad even in that comparison. At the minimum Gor, like, wears what it is on the sleeve. You can't read Gor and go "You just don't understand, the girls just can't be freed, it's not justifying slavery". Like Gor is an out in your face manifesto of a dyed in the wool mysoginist philosopher and there is no mistaking it for anything else. Rising of the shield hero is created to cater to a wider audience than just hateful incels, and in this manner, acts as a recruiting ground for young men on the margins, teenagers who haven't yet had sexual contact and are a bit socially awkward and, well, get pushed into mysoginist hate spirals like works of media like Shield Hero.
There's a huge difference between "Rape is totally no big deal at all, it's perfectly natural. Just rape any girl you see, they'll eventually enjoy it after they stop trying to put up a fight!"
and "Women are bitches, they deserve to get raped as a punishment".
Both are horrible, bad viewpoints to have and is WAY BEYOND problematic as hell. But at least, one of the viewpoints at least recognizes rape as a bad thing.
And for those who doesn't know much about the Gor series, the author's also been accused of pedophila too in the past. there's passages in the books where it talks about grooming young girls into sexual slavery, even though he overly stresses that their virginity isn't taken until they're "of age". They conviently leave out what age that is, just stating that they are "old enough". That's when the young girls are brutalized and raped, etc. Just litterally beat up into living, breathing pulp, etc. And this is depicted as a perfectly natural thing that girls will come to enjoy deeply in time, even if they might cry about it at first.
And terrible as Naofumi is, at least he gives you the side eye if you even hint that you're into young girls or want to sleep with little girls.
I think part of why he gets under people skins so much, is the fact that the series seems to acknowledge that both slavery and rape are terrible things, But then the series goes ahead and have people do those things anyways. and then goes on to hypocritically say "Slavery is bad, but it's also good if it's the hero doing it and not those awful men out there!"
Which is something I can understand. It's easy to hate somebody who knew something was wrong, and then went ahead and did it anyways. But to say that's worse than somebody who honestly thinks that Rape and Slavery is honestly no big deal at all? Ehhh.....
You know, in the end, I prefer the open nazi goosestepping in his SS reanactment uniform for he is easy to spot and ostracize to the cryptofash hiding his powerlevel and trying to appropriate milk and the OK sign as nazi symbology.
Also, Gor's philosophizing is deeper than just "Rape em til they like it". But, honestly, it's not worth going in to because it's still fucking awful.
More like "this one woman in particular is a liar because she just wants to make Naofumi suffer."
There's an obvious division between "good women" and "bad women" in shield hero.
And, truly, it isn't that different to Gor. The "good" women in Gor don't get raped by the "heroes" either. And when "bad" women become "good" women, what they go through "ceases" being rape. Malty "Deserves" rape for she is a "bad" woman. Her sister, or Raphtalia wouldn't be raped because as "good" women, they are already submissive to the "hero's" will.
The real difference is that gor is a series that cares a lot about the societal ramifications of gender roles and submission that's trying to make an argument of the "natural" state of female and male relations where they would be the most happy, while Shield hero is an entirely egocentric setting where good and ill is defined entirely on the axis of Naofumi and how he is deserved waifus and respect, but is constantly denied it and put upon by chads and stacies just like the hypothetical viewer is. Which is another, uh, dimension of shield hero that grosses me out beyond Gor. It's way harder to insert yourself into the shoes of any of the Gor protagonists (I mean the first is an author insert, but the author does happen to be a well educated professor of philosophy and so not really someone most modern incels identify with. I imagine he plays better with, like, the alt right rationalists, but Peterson just caters to them so much harder. John Norman is, I find, rather niche in alt right circles. He's way bigger in kink communities, but, like, not taken that seriously. Gor's just super kinky)
Naofumi is incel extreme, crafted in a lab to be an insert for lonely young men worried about their lack of attraction and purpose.