Are folks actually questioning the "just" nature of a law, really? If so, which law?
Or are folks questioning whether that law is being falsely applied in this instance?
I think it's the latter. Folks are saying, essentially, that he wasn't part of the conspiracy to commit a cybercrime but that he was working as a journalist who simply received information. That's a very fact-dependent claim. I don't think folks here would say that journalists have blanket immunity to commit cybercrime or anything like that -- this seems like a dispute over the facts. Of which we have basically none.
There are recordings of GG kind of "coordinating" actions of the hacker group right in the middle of the process of extracting private messages. Hacker would ask GG's opinion about what to do next: 1. expand the attack 2. stop and assess what they've gotten so far. Then GG clearly advise them to continue to extract more data. So state attorneys now think this attitude "crossed some lines" with crime to which GG is an accomplice.
While this is true, the related question over whether the law in question is "just", is very much a relavent issue, and something worthy of comment.