The kill? The horde deserve it far more than the alliance.
The horde suffered betrayal and incredible losses. And while everyone turns against them, they are still trying to get back to their former glory, when the horde wasn't crumbling apart because of an incompetent leader!
The alliance doesn't deserve the kill. They are there, saying "they are bad so we should kill them", but completely forget that most of the horde is not this way. They can help, but it is not their job to kill him.