She, and I'm arguing that from a story standpoint, the Alliance just definitively handed the Horde its ass on a platter, put the revolutionaries in a position where they have no choice but to play ball with Alliance demands, and then took the high road after letting them pick a Warchief that'll play ball. To the Horde, that would be little more than salt on the wound--"We could mop the floor with you guys, but we're not. We have other shit to focus on." That serves two purposes--it can build to a coalition for the next expansion's inevitable mutual threat that's out for our blood, and seeds discontent for the war to heat back up later when another fiery orator with the empathy of a slug has enough playing nice with the other team.