All who strive to live for something beyond mere selfish aims find their capacities for doing good very inadequate to their aspirations. They do so much less than they want to do, and so much less than they, at the outset, expected to do, that their lives, viewed retrospectively, inevitably look like failure.
The difficulty that WikiLeaks has, of course, is that we can't go around speculating on who our sources are. That would be irresponsible.