I think that if the Guardian dare publish something like this, it would undo all the work they've done to reach out to the UK's security services and convince them that the Guardian is partriotic and responsible in relation to national security issues.
Also Melzer is arguing that Assange is the victim of a massive and deeply-rooted plot or conspiracy to destroy him for daring to reveal the war crimes of leading Western democracies, and the media is complicit in this conspiracy to silence the truth and keep the facts from the public.
All of that is simply too much to contemplate, let alone address, because if only a bit of Melzer's argument is true, it reveals the face of a state that's massively different and potentially highly un-democratic, to the liberal narrative the Guardian and the rest of the media are selling their readers. It's all too much. Some stories are just too true to be good.
In reality it's Melzer that should be awarded the Orwell Prize, just for this one piece, not Moore, who's being rewarded for 'not' writing anything even remotely worthy of George Orwell's stamp of approval. Oh, the irony. Now one gets the Orwell Prize for writing propaganda the state can live with!