Here’s how a free press, one owned by a handful of corporations, uses its freedom. It simply tells you what it is good for its business interests, or more generally for the political and business environment it operates in. It’s not interested in truth or airing all sides, or even necessarily basic facts.

The only restraint preventing the corporate media from outright lying to promote its material interests is the fear of being found out, of readers starting to suspect that they are not being told the whole truth.

If that sounds like conspiratorial nonsense to you, consider this single example (there are lots more if you trawl through my past blog posts). Let’s take the matter of veteran Middle East reporter Robert Fisk arriving in Douma this week, the first western correspondent to get there. Fisk is like some relic from a bygone era, when journalists really sought to arrive at the truth, often at great personal danger, not simply win followers on Twitter.

Until his arrival, all the information we were receiving about Douma in the west originated not with on-the-ground reporters, but with jihadist groups or those living under their Islamist reign of terror. That was true of the Youtube videos, the accounts from western reporters based far off in other countries, the human rights organisations, the World Health Organisation, and so on. The fog of war in this case was truly impenetrable.

So Fisk’s arrival was a significant event. He was clearly aware of the journalistic burden on his shoulders. Those still in Douma, after the jihadists fled, we can assume, are mostly supporters of the Syrian government. Even if they are not, they may be fearful of retaliation from the Syrian army if they speak out against it.

So Fisk, a very experienced reporter who has won many awards, was careful in the way he handled the story. Unlike many reporters, he is prepared to add context to his reports, such as the manner or tone of the person he talked to – clues to help him and us decode what they might really be thinking or meaning, rather than just what they are saying.

But the content of what he reported was incendiary. Just a few days after the US, UK and France had bombed Syria, in violation of all principles of international law, on the grounds that the Syrian government had used chemical weapons in Douma, Fisk interviewed a doctor at the clinic where the victims were treated. The doctor said no chemical attack occurred. The video footage from last week was genuine, the doctor added, but it showed civilians who had inhaled dust after a Syrian bombing attack, not gas.

Fisk’s account is clearly honest about what he was told. And the doctor’s account clearly is plausible – it could fit what the video shows. So, whether right or wrong, it is a vital piece of the jigsaw as we, ordinary citizens, decide whether our governments were justified – before United Nations inspectors had even arrived – in acts of aggression against another sovereign nation, and whether, in the case of the UK, Theresa May was entitled to act without reference to parliament. These are matters Jeremy Corbyn, the leader of the UK’s opposition Labour party, has been trying to raise in the face of a solid media consensus in favour of bombing.

Given this context, the UK media ought to have been putting Fisk’s report at the centre of their Syria coverage yesterday and today, especially the liberal Guardian, the paper that Labour party members have relied on for decades. So how did the Guardian fare?

The Guardian now has an enormous output of articles, not least its Comment is Free section. So it would be foolhardy of me to say with absolute conviction that the Guardian made no reference anywhere in its pages to Fisk. But if it did so, it was extremely well concealed. A Google search of “Fisk”, “Guardian” and “Douma” throws up nothing. I can locate nothing in searching the Syria news articles and the op-eds published in the physical newspaper either.

So the Guardian appears to have intentionally blocked its readers from learning about the Fisk report, even though it is highly relevant to an informed debate about western actions in Syria, actions that are themselves part of a political debate being led by Corbyn. Denying this information to its readers means the Guardian is actually helping to weaken Corbyn in his battle to hold May to account.

But it does not end there. The Guardian does briefly reference Fisk, it just does so without naming him. At the same time, the Guardian seeks to discredit his reporting using the very same, highly compromised sources that have been relied on till now from Douma. In short, the Guardian appears to be carrying out a damage limitation operation, refusing to report transparently Fisk’s revelations in an attempt to shore up the existing narrative rather than test it against the new narrative offered by Fisk.

Buried away in two lines in an article by Patrick Wintour and Julian Borger, we get this in today’s Guardian:

A group of reporters, many favoured by Moscow, were taken to the site on Monday. They either reported that no weapon attack had occurred or that the victims had been misled by the White Helmets civilian defence force into mistaking a choking effect caused by dust clouds for a chemical attack.

So Fisk, Britain’s most famous and respected Middle East correspondent (can you name another one?), is not only not identified but dismissed generically as one of a group of reporters “favoured by Moscow”.

A second report, headlined “Syrian medics ‘subjected to extreme intimidation’ after Douma attack”, by Martin Chulov and Kareem Shahin, far away in Beirut and Istanbul respectively, confidently denigrates Fisk’s account, again without identifying him or mentioning that he was there. Again, it merely alludes to the content of Fisk’s account and only in so far as it is necessary to undermine it.

Instead, it gives top billing to unchallenged claims by Dr Ghanem Tayara, a Birmingham-based doctor now in Turkey who is the director of the Union of Medical Care and Relief Organisations, which favours the overthrow of the Syrian goverment.

After many paragraphs of Dr Tayara’s allegations against Bashar Assad’s government, Fisk’s account is given this cursory and hostile treatment near the end of the article:

Medics and survivors who have remained in Douma, and others who have fled for northern Syria, ridiculed competing claims that the attack either did not take place, or did not use gas. … Some doctors have appeared on Syrian television to deny that anything took place in Douma. A doctor who spoke to the Guardian said: “Our colleagues who appeared on television were coerced, because some hadn’t served in the military or completed their degree, and for other reasons, some had family in Damascus. They decided to stay in exchange for being reconciled with the regime. But the regime used them.” Another medic who treated victims said: “Anyone who has knowledge of what happened cannot testify. What was being said is that the medical centres would be destroyed on top of those working in it.”

These countervailing voices are important. They are another piece of the jigsaw, as we try to work out what is really going in places like Douma. But publications like the Guardian are consistently presenting them as the only pieces their readers need to know about. That isn’t journalism.

There are good reasons to be suspicious of everything that comes out of the Syria war arena, where all sides are treating the outcome as a zero-sum battle. But western corporate media are clearly not fulfilling their self-declared role either as an impartial messenger of news, or as a watchdog on power. They have taken a side – that of the governments of the US, UK and France, their regional partners Saudi Arabia and Israel, and what are by now mostly proxy jihadi fighters in Syria.

The Guardian failed the most elementary test of honest journalism in its treatment of Fisk’s report. It may be an egregious example but after many years of the Syria war it is very far from being unique.