Originally Posted by
Aldo Hawk
Because all that happened to Blood elves was a name change, obviously.
Let's not talk about the annihilation of 90% of their population, the change in regime (Thing that High elves avoided by no longer being Quel'thalas citizens.), the lack of the substance that maintained them stable and the uses of smaller and dosified amounts of that substance (Through methods that High elves didn't shared.), and even the use of other substances as replacement (Like Fel, Valeera shows Blood elves consumed some amount of fel in some way and/or quantity, thing that High elves didn't do.), the change on their fountain of power that they, as rulers of Quel'thalas utterly own, and all that it implied (Never returning to the ways of the Church of the Light, for example, having abandoned it even before that.), the drastic difference in allies, like, you know, the Horde instead of the Alliance, the abandonment of traditionalism in the use of certain magics and beliefs, not abandoning the place where they have had their nation since seven thousand years ago, etc, etc, etc...
Just a damn name change, obviously.
Not any of the two groups is the same they were before the Scourge invasion, and as of today, the two of them are different.