Time and time again, it is the alliance that sets aside the atrocities of the horde, and “forgives and forgets” for the sake of peace at the end of an expansion. For BFA, this should finally be flipped.
The alliance needs to commit a horrible theramore level atrocity. Something that makes alliance players go “why would we do that?”. And, the horde need to just take it and end it by “walking away”, without any retaliation. That the horde for once, if only briefly, ends the cycle this time around by being “the better half”.
Essentially, flip the script. The alliance ends as the bad guys, and the horde gets to end as the mature party seeking peace for the good of all. The alliance finally get their hands dirty and have their fist pumping moment, and the horde finally get to end an xpack without being the mustache twirling villains.