The failure of WL is that rather than focus on doing journalistic work, it became the Julian Assange show with Julian Assange about Julian Assange. And then it becomes much more questionable that WL was only publishing information that might harm the Clinton's campaign while he was simultaneously in talks with her opponent's campaign about obtaining a pardon from Trump.
When you start operating like that, you lose any and all credibility and protection you might have some sort of journalistic organisation. At best, WL can be described as activists, at worst as useful idiots.