Like, I get where you're coming from, but in a series chock full of eugenics (that's theoretically bad but never really addressed), maybe don't have an entire race of happy slaves?
Oh, the hell it isn't addressed. Literally the entire conflict is over the wizard "eugenicists" being oppressive, genocidal, usually inbred, lunatics framed specifically as, and understood in no context other than, categorically evil. Sirius himself points out there is no such thing as an actual "pureblood" family, the term actually has no real universally agreed-upon definition, and the pureblood maniacs are in self-denial, or projecting feelings of inadequacy based on arbitrary social standards
no one is capable of meeting. Beyond that, "pureblood" families not overtaken by pureblood mania are depicted as being apathetic at worst about blood status, and that intermarriage is simply a byproduct of wizards keeping to their own community, out of convenience or necessity (i.e. the statute of secrecy).
Outside even that, it's awful funny how we never really wanna have that conversation that most "pureblood" families' privilege -- most notably, within the Malfoy family -- is the product of
generational wealth and status. Eyes always on the Malfoys and Blacks, and far,
far, away from the working-class Longbottoms and Weasleys, and by all means necessary, never,
ever on that giant vault full of gold and the literal fucking deathly hallow that Harry inherited from being the scion of one of the oldest pureblood families in the setting.
Oh, and hey? remember when Slughorn was legitimately surprised by Lily and Hermione being skilled muggle-born witches, and how that was immediately understood as racism and to interpret in any other way means the interpreter themselves must be racist? Except, Slughorn actually had a point that
certain people would rather ignore -- neither Lily nor Hermione lived as small children in the wizarding world, indeed neither had the first idea magic even existed until they were accepted into Hogwarts. Meaning, they started with educational and social disadvantages to overcome first and foremost, which someone like Harry never had to face despite having a muggle-born's background, thanks to the wealth and fame attached to his name.
Kind of like how in the real world, HDC's face educational and social disadvantages, that perpetuate and enable downward social mobility and generational poverty. And from that, how implicit racial biases intersect with socioeconomic biases, in ways quite perceptible to those without ulterior motive to protect socioeconomic self-interest. Is it any wonder Harry Potter hate comes not from the evangelical right nowadays, but near-exclusively white and bourgeois, lousy with delusions of beneficent grandeur?
Or in case the point's been missed, this is all identity reductionist bullshit and I'll have none of it.
The statue that defenders are quick to point out as "here's an example of Dumbledore calling out wizard society" says that the wizards placing themselves above other was a *lie*, not that wizards were dicks sometimes. If House Elves were like you say, they wouldn't be *slaves*
Who's the party calling house elves that, again?