Just when we thought we'd seen the back of one axis of evil, up pops another one to give us all sleepless nights. The original axis of evil, as defined by President George W Bush in his State of the Union address in January 2002, consisted of Iraq, Iran and North Korea. In fact, this axis was always an unlikely amalgam, conjured from the imagination of David Frum, the President's chief speechwriter at the time, who was casting around for a suitably demonic phrase to capture the gravity of the threat America was said to face from its combined enemies...