The most febrile of George W. Bush haters liked to claim during his tenure that the former president “scared” them. There is far more reason to be frightened by President Obama, because fecklessness and inconstancy trigger wars.

The outstanding example of weakness inviting aggression was the conduct of the democracies toward Adolf Hitler in the 1930s. Though it has been retroactively tainted as shameful cowardice, the policy of appeasement grew out of a “war weariness” that was far more understandable than our own. Britain and France suffered millions of dead and wounded in World War I and were desperate to avoid a repeat. The Munich Agreement, which ceded part of Czechoslovakia to Germany (without its consent), was signed by Britain and France in hopes that Hitler’s ambitions were limited, but in any case because they believed appeasement was the best way to avoid war.