That's one of the reasons that I don't want the Horde to descend into warmongering, because really the Alliance is such a shit villain. 3/4s of them were total goody two-shoes even before BfA made literally everyone but Tyrande and Jaina (half the time) into Anduin groupies. They barely have a bone of malice or even contemptuous self-righteousness in their body. I could definitely see Yrel's Lightbound as compelling villains, but the Alliance? I don't give a shit about them, they're more boring than a pack of Quilboars. Identifying myself in opposition to them sounds about as pointless as identifying myself as being against a box of chocolates.
"Let's live in the desert and not do shit, but honorably" isn't too much of an identity either, granted, but Blizzard has shown that they can make a political entity more complex than a single concept, even recently with the Zandalari. I don't see why the Horde should have to be reduced to either genocidal warmongers who have a totally unreasonable Alliance hateboner, or peace-loving honorable traitors who have an unreasonable fondness for the Alliance. Alas, that is the dichotomy presented by the narrative.