The war on terror, that campaign without end launched 14 years ago by George Bush, is tying itself up in ever more grotesque contortions. On Monday the trial in London of a Swedish man, Bherlin Gildo, accused of terrorism in Syria, collapsed after it became clear British intelligence had been arming the same rebel groups the defendant was charged with supporting.

The prosecution abandoned the case, apparently to avoid embarrassing the intelligence services. The defence argued that going ahead withthe trial would have been an “affront to justice” when there was plenty of evidence the British state was itself providing “extensive support” to the armed Syrian opposition.

That didn’t only include the “non-lethal assistance” boasted of by the government (including body armour and military vehicles), but training, logistical support and the secret supply of “arms on a massive scale”. Reports were cited that MI6 had cooperated with the CIA on a “rat line” of arms transfers from Libyan stockpiles to the Syrian rebels in 2012 after the fall of the Gaddafi regime.

Clearly, the absurdity of sending someone to prison for doing what ministers and their security officials were up to themselves became too much. But it’s only the latest of a string of such cases. Less fortunate was a London cab driver Anis Sardar, who was given a life sentence a fortnight earlier for taking part in 2007 in resistance to the occupation of Iraq by US and British forces. Armed opposition to illegal invasion and occupation clearly doesn’t constitute terrorism or murder on most definitions, including the Geneva convention.

But terrorism is now squarely in the eye of the beholder. And nowhere is that more so than in the Middle East, where today’s terrorists are tomorrow’s fighters against tyranny – and allies are enemies – often at the bewildering whim of a western policymaker’s conference call.

For the past year, US, British and other western forces have been back in Iraq, supposedly in the cause of destroying the hyper-sectarian terror group Islamic State (formerly known as al-Qaida in Iraq). This was after Isis overran huge chunks of Iraqi and Syrian territory and proclaimed a self-styled Islamic caliphate.

The campaign isn’t going well. Last month, Isis rolled into the Iraqi city of Ramadi, while on the other side of the now nonexistent border its forces conquered the Syrian town of Palmyra. Al-Qaida’s official franchise, the Nusra Front, has also been making gains inSyria.

Some Iraqis complain that the US sat on its hands while all this was going on. The Americans insist they are trying to avoid civilian casualties, and claim significant successes. Privately, officials say they don’t want to be seen hammering Sunni strongholds in a sectarian war and risk upsetting their Sunni allies in the Gulf.