You haven’t shown this at all; but then, you could comb the couple hundred starting zone quests for every vaguely shady titbit therein, and it still wouldn’t be true. Blood elves ran the full moral gamut in TBC: a corrupt, compromised prince and his fel-drunk zealots warring with redemptive defectors for the soul of their people; manipulative, power-hungry magi clashing with principled, fair-minded rangers; innocent, downtrodden citizenry put upon by dark, disillusioned knights, themselves haunted and tormented and full of all sorts of conflict. Supplements like Blood of the Highborne and Chronicles #3 explored this period of blood elf history at far greater length than the video game did, and there was a lot more going on there than “bad race does bad things because bad.”
I don’t know why you’re acting like the race disappeared after TBC. We’ve hardly gone an expansion without Hearthstone icon Liadrin and her redeemed knights popping by to remind us how ungodly boring the human/dwarf flavor of paladin is, since that’s their branding now. All those edgy Blood Knight quests were removed or rewritten to be more wholesome. Theron went from a hollow, loreless puppet with Kael’s fingers up his derriere to a “world hero” character whose wiki page is so long it lags my phone. Christ, the Alliance’s spymaster and his pirate boyfriend visited Silvermoon City last year and described it as a beautiful wonderland whose darker elements were confined to “darker times,” as most of us inferred well over a decade ago.
If you’d led with this comment I wouldn’t have responded, except maybe with a like. I agree with this take. But your broad interpretation of this race is as off-base as the one you first responded to IMO.