If you want to humble an empire it makes sense to maim its cathedrals. They are symbols of its faith, and when they crumple and burn, it tells us we are not so powerful and we can't be safe. The Twin Towers of the World Trade Center, planted at the base of Manhattan island with the Statue of Liberty as their sentry, and the Pentagon, a squat, concrete fort on the banks of the Potomac, are the sanctuaries of money and power that our enemies may imagine define us. But that assumes our faith rests on what we can buy and build, and that has never been America's true God. On a normal day, we value heroism...