That DOJ? which tried to overthrow & thwart President Trump whole time? was "Trump's"? Really?

Perhaps you mean Trump could have overrode them, by simple uttered pardon of Assange?

I say yes -> thus I say Trump failed Assange.

But you need to tread carefully. Because that would show USA has "unitary executive" where President's executive word is final....

.... in other words, zero "classified docs" case left, as Trump had declassified whatever, either by numerous declarations of same before he left, or in the act of taking it with him.

Also, Criminal Biden occupies White House RIGHT NOW. Criminal could do for Assange, now.

Instead, Criminal censors or imprisons any number of additional journalists or own citizens.

So yeah he's worse.

PS. President Trump did nothing publicly to help Assange. A failing.

It was Trump's DOJ that requested Assange's arrest in London and indicted him. Trump went farther than merely not helping Assange; he actively prosecuted him.