I admit that I am not a lore buff, so I may be very far from the mark here.
Am I right in saying that in the entire game there are almost no bosses in some dungeon or raid that does not have a direct connection to the major story line of the expansion? Are there any bosses that we need to fight just because they are just plain evil villains that don't care about the Burning Legion, Scourge, Deathwing, Sha?
They are just there because they are evil SOBs that deserve to die