Well, you raise an interesting point. What does Wikileaks do, and why do they believe they're doing it? The closest thing to an answer I can find is on their website's "about" page:
WikiLeaks is a multi-national media organization and associated library. It was founded by its publisher Julian Assange in 2006.
WikiLeaks specializes in the analysis and publication of large datasets of censored or otherwise restricted official materials involving war, spying and corruption.
( https://wikileaks.org/What-is-Wikileaks.html )
What I'm surprised I never noticed before is that they never state why they do these things. What are they expecting to accomplish, and how will the world be a better place once they've achieved their mission? Is it to promote enlightenment ideology, humanist progress, or is it something altogether less altruistic? Why don't they provide an answer or statement regarding their motivation? Even "we do this because we're tired of the bad guys having their way with reality and ruining/wasting the minds of generations" would be preferable to saying nothing. It's not enough to state what they do without stating what their purpose is. That purpose is how the world can measure their success or failures.