He is definitely an arrogant kind of guy, but the movie literally portrays him as having been in some kind of cult wherein everyone bleaches their hair white. That kicks him down from "arrogant asshole" to "crazy, God complex cult leader" to people watching the movie.

And really, from what I can tell, he's not done anything particularly immoral. No evidence has come out that anything he leaked harmed any Americans. He sifts through all leaked material before just publishing it willy nilly.