The US media absolutely is A problem, but telling partial truths doesn't actually count as telling the truth. Assange openly stated he judged leaks on "impact" and obviously timed things near the end of his tenure in order to stir more shit. I don't consider that airing dirty laundry, I consider that attempting to influence things.

There is a difference between "look at this bad thing a person did, and consider it over a course of time so you can make reasoned decisions about it" and "THE ELECTION IS TOMORROW HERE'S STUFF THAT YOU CAN'T EVEN BE SURE IS TRUE NO TIME TO THINK JUST ACT ON IMPULSE".