Wikileaks politicized themselves, look at their Twitter. They clearly made a conscious decision to take a side in a partisan election, rather than just releasing documents and letting them speak for themselves. You can agree or disagree with that decision, but I don't think there needs to be an astroturf conspiracy driving this narrative.

If they only commented on their leaks, that would be one thing, you can't really blame them for not having any Trump documents. But they've given extensive commentary on the email scandal and the FBI investigation, which frankly have nothing to do with their leaks.