//Neither do I, but, he was not a hacker.//
Was he not?:
https://www.britannica.com/biography/Julian-Assange
“As a teenager, he demonstrated an uncanny aptitude with computers, and, using the hacking nickname “Mendax,” he infiltrated a number of secure systems, including those at NASA and the Pentagon. In 1991 Australian authorities charged him with 31 counts of cybercrime; he pleaded guilty to most of them.”
That will do to be going on with but if you dig deeper you will find that he developed an obsession with hacking into secure systems and spent much of his life before Wikileaks doing so. He didn’t do it because he wanted to or needed to; he did it because he could and he was obsessed with it.
He was indiscriminate with what systems he hacked into and, in particular, what he did with the information. He published the Chelsea Manning data with scarcely a clue what most of it contained. There were over half a million documents and he would have had no idea of the nature of the vast majority of them.