Ketsumei of Bleeding Hollow makes a pretty good point on the forums: we're killing off Horde heroes, and Alliance are getting a pass. Actually, the Horde heroes point isn't quite a valid one-- yes, we've taken down Kael'thas, Rend Blackhand, and eventually Zul'jin, but we've also killed off Emperor Thaurissian, the Architect of Stormwind (many, many times), and Mekgineer Thermaplugg, not to mention that eventually we'll be killing the number one figure in Alliance lore, Arthas himself. Oh, and some lady named Katrana Prestor, usually found sitting on the left hand of the throne in Stormwind, has been killed as well. But it's true that more instances, especially raid instances, are featuring the deaths of Horde races rather than Alliance races. Especially in the endgame, we're fighting Trolls, Orcs and Blood Elves, not Humans and Draenei.
So what's with the imbalance? This Horde-heavy enemies list is actually a very recent thing-- Scarlet Monastery is full of Humans, as are the Deadmines, and BRD is full of Dwarves. But as we've headed to Outland, the Burning Legion seems to have a thing for recruiting Blood Elves and Orcs, and Zul'Aman will bring about the death of many, many Trolls. Far many more Horde cries of death are being heard lately, and that's just racist.
There's only one thing for it-- as players suggest, we should be allowed to kill a corrupted Malfurion Stormrage in the Emerald Dream expansion. No arguing now-- let's say he's gone insane from fighting the Nightmare and he's got to be put down. We need an instance full of Night Elves to kill over and over again. Oh, and while we're at it, let's have Arthas bring Uther back as a Scourge, and kill him, too! And what's the King of Stormwind up to-- isn't time he died, too?