Maybe everyone is misreading America's views on foreign policy? Among Republicans, there's a big argument between the so-called isolationist wing of the party and the ostensibly interventionist wing. On the left, there's a similar debate (though liberals are never described as isolationists no matter how isolationist they might be). Among Democrats, the dividing lines are murkier if for no other reason than the Democratic Party takes its lead from President Obama, and his own views are murky, to put it charitably. The biggest boon to the anti-interventionists is the simple political reality that Americans just don't want to intervene in...