I think savathuns ultimate goal is protecting the traveler from the witness. She's deceived many in her time, but the most impressive deception of hers was the witness. She knew that if her plan to take the traveler failed, then we were the next best ones to protect it. That's why I think she spent her time as osiris forging an alliance with the cabal and removing the political enemies of the vanguard to unite the city. I think she also gave crow his memories back to make him feel responsible for taking on the leadership of the hunters (which we still have to see come to fruition). Who knows, maybe she knew that he would feel the guilt of uldren and that would make him kill the psion and then Saladin would join the cabal, further cementing our fragile armistice into a unified alliance (although that seems a little too specific even for savathun). She even says as much to us when we kill her at the end of witch queen "the game is now yours to win or lose." To be clear, I DON'T think she did these things to protect humanity. I think she did these things to protect the traveler and resist the witness. Savathun is still responsible for millions of human deaths and the suffering of many more. She isn't an ally of humanity: we're just a pawn in her game with the witness that she needs to keep on the board to win.
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And what? Look like Witness can just turn off that oversized golf ball. If cabal could turn it off. Then Witness can turn it off for good or even destroy. But Bungie not gonna do it. Because their story writing is very bad. We could lost traveler at start of Lightfall, lose our light and light subclasses, then go to Neptune acquire new class that connected with darkness, become taken in middle of a year and in the very end if Lightfall year, on last week we go to finally face Witness, mission begins, we see our guardians land at his ship, we see his apartments camera closer, we see Witness face and he then he opens his eyes... then bam!! black screen and notice on it "lost connection to Destiny servers"! After few unsuccessful tries you decide to look into app or site and discover that all your characters and progress was deleted.
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