LONDON – Since Hiroshima and Nagasaki the presumption has been that war can get no worse. The world has been spared a second nuclear war, so this presumption has a measure of truth. But the planning for major war has grown more alarming in all manner of ways – proliferation certainly but, not least, in the relatively recent statements of the U.S., Russia, the UK and France who, signalling a momentous shift in military doctrine, say that they are prepared to use their nuclear weapons for war fighting and not just for deterrence, as during the Cold War. When Hans Blix was the UN inspector charged with investigating whether Iraq still possessed weapons of mass destruction he once said that anyone can hang out a sign “beware of the dog”, but it doesn’t mean they have a dog. In Saddam Hussein’s case this turned out to be correct. These days...