I think I recall the story behind Rasputin being, for the greater good, he had to let some people die to save Earth. I don't think he was ever shut down/compromised by whomever.
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That's one of the theories, yes. Sacrifice many, to save the rest v
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Though I agree there is something fishy about the Speaker. If you follow the theory that Hive are just dead "guardians" from the last species the Traveler was with (or one from the past, what-have-you) then one might assume that the Speaker is hiding powers similar to the powers of Oryx and Crota (meaning the two of them and the Speaker are gods created by the Traveler) then who is to say he is corrupt/'evil' as the latter two. [spoiler]You'll find out on the next episode of "WHERE'S, THAT, STORRRRYY"[/spoiler]