It has long been clear that Curveball – the Iraqi defector who provided much of the basis for the US government’s claims about the existence of weapons of mass destruction in the run-up to the Iraq war in 2003 – was a liar. But he has now finally admitted that he made up his claims about mobile bioweapons laboratories, which US Secretary of State Colin Powell used as a justification of invading Iraq in his famous presentation at the United Nations Security Council in February 2003. Curveball, whose real name is Rafid Ahmed Alwan, had until now refused to speak to the press. But in an interview with the Guardian earlier this month in Karlsruhe in Germany, where he now lives, he said that he lied in order to help topple the regime of Saddam Hussein. “I and my sons are proud of that and we are proud that we were the reason to give Iraq the margin of democracy”, he said. Obviously, this was a huge cock-up with disastrous consequences. The question is: whose fault was it?