Why do we still go to war? We seem unable to stop. Britain's borders and British people have not been under serious threat for a generation. Yet time and again our leaders crave battle. Why? Last week we got a glimpse of an answer and it was not nice. The outgoing US defence secretary, Robert Gates, berated Europe's failure of political will" in not maintaining defence spending. He said Nato had declined into a "two-tier alliance" between those willing to wage war and those "who specialise in 'soft' humanitarian, development, peacekeeping and talking tasks". Peace, he implied, is for wimps. Real men buy bombs, and drop them. Libya has cost Britain 100m so far, and rising. But Iraq and the Afghan war are costing America $3bn a week, and there is scarcely an industry, or a state, in the country that does not see some of this money. These wars show no signs of being ended, let alone won. But to the defence lobby what matters is the money. It sustains combat by constantly promising success and inducing politicians and journalists to see "more enemy dead", "a glimmer of hope" and "a corner about to be turned". Victory will come, but only if politicians spend more money on "a surge".