Wikileaks is journalism in the same sense that a billboard used by graffiti artists is journalism.
That is to say, it is not at all journalism: Wikileaks does not editorialize (except, of course, when it comes to timing releases and such things). Journalism is not only the simple act of reporting facts, but also the act of adding commentary and providing context for those facts; without that, you get situations where people read something on wikileaks, and come to very wrong conclusions about what is being said or what happened in actuality (as an example, there's a rumour going around that one of the emails in the Clinton dump proves that the Democrats had Scalia killed. Which is of course utter bullshit,
as anyone who can do research could tell you, but who cares about reality when there is another thing to add to the giant conspiracy theories trumpeteers are so fond of).
It may have started out with good intentions. It has turned into an unwitting tool for conspiracy theorists, idiots, small-handed vulgarians and dictators. It's not just laying bare the backroom dealings of the powerful, but also putting
lives at risk because apparently individual lives do not matter to them in their quest for truth.