Still, let's check:
Any popular (read profitable) manga out there making use of slavery, almost as if it were a good thing? Extra points if they fetishize it as much as possible!
https://mangadex.org/title/12672/tate-no-yuusha-no-nariagari <- Became an anime.
https://mangadex.org/title/15950/isekai-maou-to-shoukan-shoujo-no-dorei-majutsu <- Became an anime.
https://mangadex.org/title/14850/death-march-kara-hajimaru-isekai-kyousoukyoku<- Became an anime.
https://mangadex.org/title/21699/isekai-meikyuu-de-harem-wo <-Profitable Stockholm syndrome
...and how many get viciously downvoted because of how they depict (or use) slavery?
How many manga make light of killing other humans?
https://mangadex.org/title/1101/monster
https://mangadex.org/title/11134/inuyashiki
https://mangadex.org/title/34404/fukushuu-o-koinegau-saikyou-yuusha-wa-yami-no-chikara-de-senmetsu-musou-suru <-Doesn't have an anime, all other titles listed do.
https://mangadex.org/title/84/deadman-wonderland
https://mangadex.org/title/272/gantz
https://mangadex.org/title/607/berserk
https://mangadex.org/title/2777/bokurano
...and how are we dealing with moral issues that are denying life to a fellow human being?
How many manga are literal powertrips about being able to destroy everyone and anything that opposes you?
https://mangadex.org/title/31477/solo-leveling <-Extremely popular
https://mangadex.org/title/14048/overlord <-Anime.
https://mangadex.org/title/8466/darwin-s-game <- Anime.
https://mangadex.org/title/18091/arifureta-shokugyou-de-sekai-saikyou <- Anime.
Clearly, a lot of manga thoughtlessly deal with delicate issues, some even add a fluffy art to it to make it cute. -> Mahou Shoujo Madoka Magica and Higurashi no Naku Koro ni come to mind, but there are many.
Are you going to hate every single one of those?
If you say yes, good for you. You are no hypocrite, but I would question your sanity.
In reality, your brain probably didn't react to this because you're either, desensitized to it, or because you can see the difference.
It is not real, therefore, if someone draws a doodle screwing another doodle, it doesn't matter (unless it's a psych test, but man isn't that a bit of a stretch?) under no circumstances, ever.
Because it doesn't exist.
...and also, how come nobody was making an outrage about Guts or Alucard getting raped when they were kids? Huh...
Sidenote:
Slightly unrelated but I'm going to make a big assumption and guess that you're not from Europe?
Never make an issue (like actually being raped IRL) a political or partisan issue. (and I said "politically correct", mind you)
You're a human being first, and a member of whatever political agenda later.
If your mind is wired like that, your society is setting itself up for failure, because everything, even the smallest thing becomes a matter of "my side against yours".
At which point you are no longer human, you're just a number that either works in favor of, or against, a party.
Although impossible, I hope that you don't take that as a personal attack. Simply a pointless observation.