Umm, yes, Tobi turned Sasuke evil, I don't think you read my post. Go back and read the manga. Sasuke was calm and told Suigetsu not to kill innocents during the hunt for Itachi, but when he fought Danzo he mercilessly pierced through Karin to get to Danzo. He has become darker and darker. Also, Karin noted his chakra as becoming colder. All after Tobi told him the truth.
And who cares if Sasuke would be living a lie. Sometimes lies are better than the truth. Sasuke knowing the truth about Itachi is a perfect example. If he lived a lie then Sasuke wouldn't be Tobi's pawn and he wouldn't want to destroy Konoha.