WikiLeaks is a private organization. They can be as secretive as they want. They're not governments. Or do all you people who demand government transparency broadcast every little aspect of your private lives?
I think too many people miss this point. Corporations are not people and can be regulated, and there's a lot of credibility in the idea that both corporations and people have different, but substantial, rights to privacy.
Governments might have a need to keep secrets in order to function well, but they don't have the right to keep secrets. (I mean, they have given themselves the right, but that doesn't make it "right".)
Governments must be accountable to the people they serve, and to the greater world. When government information is leaked to someone who is not represented by that government, how would you want it handled? Would you want them to keep and hold it, sell it to the greatest bidder, or release it to the whole world? Don't you want to know the secrets your government is keeping when they have been leaked? Did not everyone in the US have a pretty decent opinion of Wikileaks when they were mostly exposing secrets of other governments and worldwide organizations before they were given a large number of US documents?
If the tables were turned, and a Russian military officer downloaded volumes of information on current Russian operations, leaked it to a third party, and it contained information the US would want to know, wouldn't everyone in the US praise them for releasing information vital to the US that the Russians were keeping secret?
You don't have to like what wikileaks is doing, but they are generally accountable to their employees and supporters. When they aren't breaking the law of the country they operate in, what more do you want? Either believe them, or call BS and move on.