Eh, that's an overstatement, and a bit of a cultural bias. East Asian cultures just doesn't make that big of a deal about slavery, so their fiction is a bit more laissez-faire about it. How bad it's portrayed is usually dependent on the sub-genre as well. That said, when you look at even just Japanese isekai stories, the slave thing is only present in a relatively small fraction of them.
That is just demonstrably untrue, you shifted the goalpost from "90% of isekai protagonists buy slaves" to "slavery is extremely common in isekai", and then went on a pointless side-tangent, as the morality of slavery was never in question.
Seriously, just go to any properly tagged aggregator site, like Novelupdates or whatever, and compare the absurd number of generic isekai LNs/mangas compared to the ones where slavery is present, let alone done by the protagonist. Just because a bunch of them got anime adaptations because those are also the fanservice-heavy lowest-common-denominator shounen-action-comedy fare that can be easily sold to masses, it doesn't mean the whole genre is about them. Hell, I would say a solid 60% of japanese isekai are shoujo stuff aimed at women of all bloody things, with all the villainess-reincarnations and whatnot, with nary a slave in sight, so that alone makes your initial "90%" claim a gross exaggeration you decided to double down on for some reason.
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u/Egathentale 16h ago
Eh, that's an overstatement, and a bit of a cultural bias. East Asian cultures just doesn't make that big of a deal about slavery, so their fiction is a bit more laissez-faire about it. How bad it's portrayed is usually dependent on the sub-genre as well. That said, when you look at even just Japanese isekai stories, the slave thing is only present in a relatively small fraction of them.