2. If exposing the truth is always the best alternative, one wonders why Assange & co are so secretive about their own operations & movement. Clearly they have good reasons, for example Wikileaks tries to maintain the secrecy of their sources so they don't end up on jail. If they really exposed Afghan sources in these documents, the outcome for them will most likely be far worse than jail.
Personally I think WL is important and has great potential, but I wouldn't automatically consider them the good guys in every situation. It's more complicated than that.