Originally Posted by
Archmage BloodElf4Life
You're moving away from the thread, but let me assess something right off the bat: You're talking about Orcs vs Humans, not Alliance vs Horde - even if the movie tried to paint it as such. Orcs vs Humans is essentially... well, boring.
Horde versus Alliance, however, is a war filled with gray areas. The lore behind it thrives on that, if only you bothered to read about it. The whole origin of Thrall is bound to that very faction anymosity. In fact, his very name, Thrall, is the embodiement of his suffering as a slave within the keep of Durnholde. The alliance, being - borderline - zealous in their pursuit of the light, denied the forsaken a chance to prove themselves and shunned them as abominations.
I state these two because they're important to the lore behind BfA. Sylvannas vengeance was first toward the Lich King. Upon his defeat, her wounds related to the way the Alliance spat on her and her kin only burned stronger. Mix this with Greymane destroying her only chance to save her kindred...
But then, you have Jaina whom city was annihilated by the horde, people she considered as brothers and sisters. It doesn't matter if Garrosh was behind it all -- the leaders of the Horde all participated in it. Sure, it may not have been their choice, but the outcome is what it is. And then Anduin, whose father was slain because of the Horde... he, just like Jaina, held his hand out to the Horde and the Horde stomped on it. Add Greymane's who lost his city and his son to Sylvannas and her plague, Jaina who lost Theramore -- Two annihilated cities, family and friends annihilated by the same group: The Horde, now led by Sylvannas.
Horde Versus Alliance is not just about killing red or blue. It's about the very lives of these individuals, of which their whole is intricately connected in a way which one cannot truly get rid of the other, yet they cannot completely be together either, ever. And seeing this dynamic of pain but also of joy and concerted effort is what makes WoW what it is.