Originally Posted by
Vaedan
That is actually incorrect. The exile was not self imposted by high elves, it was Lor'themar who decided to exile them for the little reason of not agreeing on new methods of mana tapping and using unstable and dangerous sources of magic (like Fel) to sate their addiction. They were given no choice, they were kicked out. Blood elves did not give them any other opportunity. Lor'themar later regreted doing so, basically proving their point.
Don't forget that at the time of their exile, blood elves were not part of the Alliance anymore, but they were not part of the Horde yet (they become part of Horde during questing experience in Eversong/Ghostlands, which is AFTER exile of high elves). At that time, exiled elves who sided with the Alliance did not really sided with the enemy of their people, since Alliance was not the enemy of sin'dorei yet.
They sided with the Alliance since they possibly had friends and connections there, so it is logical they went for help in that direction. They were not really numerous and had many enemies on their territories. Many high elves indeed joined factions later considered neutral, such as Kirin Tor, so your complaint is not really on the place.
You know that they were pretty much exiled for wanting overcome addiction, not just fed it with mana? Why they did not went to Ghostlands? Well, they were kicked out, it was blood elves who did not want them there. As seen in cata, as soon as Lor'themar invited them to Ghostlands during Amani crisis, Vereesa and her rangers went to help to defend their nation, so if blood elves actually showed a good will and were willing to give high elves purpose, they would not went away.
Also don't forget that following Third War, Dalaran was completely destroyed by Archimonde. High elves who went to Dalaran pretty much did not have luxurious and comfy life. They most likely had to contribute to Dalaran's rebuilding, which took until WotLK, so actually longer then Silvermoon's restoration. After Dalaran was rebuilded, sure they were allowed to use it's comforts, but I guess they earned them, since they were there to rebuild it alongside Kirin Tor. From their point of view, it's not hard to imagine their disgust when blood elves, who kicked them from their country, went to Dalaran and wanted to share it them.
Yes, the animosity of High Elves went beyond the edge with the Purge. I guess some high elves still hold grudges towards blood elves for exiling them. In their point of view, it was quel'dorei who stayed true to thalassian way of life, while sin'dorei were all willing to meddle with dark magics and sucking mana out of living creatures. I guess these high elves, who had to endure the hardships of their exile and remained true to the name "high elves" feel insulted when blood elves, after draenei helped reignite Sunwell, now all of sudden looks like they never tortured a naaru, they never sucked mana and they were keeper of thalassian traditions all along. They were not. They come to them once their problems were fixed, but they really did not stay true their principles in the darkest hour. I don't want to say that blood elves were wrong, I'm just pointing out why some high elves may feel towards blood elves.
I believe both groups have their own arguments for being labeled real high elf and they dismiss the claim the other group has on this matter. Blood elves are in great advantage by ruling their ancestral homeland.
I'd love that too.