OH com on.
All the anti PC crowd says ''I don't care about XYZ'' but the moment something changes from white Caucasian to something else they manged to overflow riviers with their teers. Do you really want to compare the arguments used for why you couldn't have a black stormtrooper but how a white Moses or a God was totally fine because those are mythical figure?
Also in regards to straight relationships in WOW.
If it fits the story Blizzard allows straight couples (and even inter-specie), just look at Thrall who has a child because or Jaina and a bloody dragon. But Blizzard tries to keep the story of warcraft as simple as possible with mostly making betrayal a huge thing