Well Orochimaru is more of a wild card really. He is largely uninterested in destroying the world. he did attack Konoha on a whim, but that was partly a ploy to get Sasuke, and partly just for the evulz.
As for the whole "Obito turning" thing. I don't exactly see how the truth behind Rin's death would even change anything. It won't make the world any less rotten, and it won't make Rin any less dead, which are his two primary motives for doing things.
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