Board Thread:Speculation House/@comment-34633327-20171002160810/@comment-27045477-20171030050301

Salem and Cinder do not want to wipe out humans. One of them is human herself, and Divide has a ton of moral judgements towards Ozpin for how he treats the humans. They also have only been targeting the hunter academies, the centers of Ozpin's cabal's power, not the cities where the humans live. Salem also only controls a small amount of Grimm (the seers, the ones at Beacon via a Seer, and presumably the ones in the spawning grounds near the antagonists' base). Most of the grimm on the planet are on their own.

Also, though others have noted that it is an Ozpin call-out song, Sacrifice is also Cinder's theme, it has her leitmotif in the beginning and has a lot of lyrical parallels with her other image song When it Falls.

Ozpin and Cinder/Salem (counted as one since they have the same beliefs and goals) are both very well-intentioned people who believe the ends justify their means. Ozpin stands for peace and order at any cost, Cinder/Salem stands for freedom at any cost.