I think if the fall of Quel’thalas never happened then the Quel’dorei would not have fit in with the Horde and definitely would have been more Alliance flavored. They’d be too haughty to ally with a bunch of hunch backed freaks. But of course it did happen, they lost everything, were desperate and humbled, and the closest faction to them geographically had just gone through the same thing they did and that faction was part of the Horde. So again, it makes sense that Blood Elves joined the Horde. Them having a pretty model doesn’t really change that.
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