What about Leia, Han and even Chewie. Hell even R2 has been both of those haha. Leia's a politician - she's on a "diplomatic mission," remember? Han is a pirate, lives outside the law. At the very least, he lied to Greedo about "going to get" the money he owed Jabba. Chewie doesn't really get an opportunity to reveal his character for truthfulness, but he does hang around Han, so he may just be guilty by association. And yes, R2 is dependable, but he's capable of deception. Take off the restraining bolt, and I'll play back the message! Also, it is interesting how much R2 knows that he doesn't tell anyone - so the scene with 3PO telling the stories to the Ewoks is now slightly ironic - R2 knows much more than 3PO could ever tell. Granted, the "white lies" in SW are often told to save or protect oneself or others, and in the context of the story we accept their motives.