To be fair, Blizzard aren't even trying. Right before this scene, there's a multiracial Alliance army sent specifically to die, where the warrior of 25k years happily gives his life to die in a shitty swamp for a bunch of void elves and a human bint. Joined by night elves who's leader's opinion of Anduin has no effect on their willingness to die for their spiritual liege. The entire sequence of events is solid gold.
But we're veering off-topic again.