Night elves summoned demons into the world and shattered the whole damn continent cleaning up their mess. Then recently some of them even joined in with Deathwing and Rag to end the world. Dwarves released Ragnaros from his prison and worked for him for years to bring about the end of the world. Humans handed their own kingdom over the to scourge and tried to end the world. See the pattern? Why haven't we killed them off? Could it be because the actions of a few do not equal the actions of the a whole race?