What the Alliance did in the Frozen throne and in the Purge of Dalaran doesnt fit the narrative, sadly. I always wonder why this is just never a thing that's brought up anymore, like the Alliance did some really dark shit and got a pass at it. *remembers the girl being fed to the shark*
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She represented Quel'Thalas in the Alliance. It's also a good thing she wasn't on Azeroth to see the Alliance sentenced her people to die or Jaina's purge of Dalaran that her sister participated in.
And it's not a "Kael'thas blood elf order", they're called the Blood elves in memory of the fallen.