Older Americans tend to think of Social Security as something we ought to be able to afford. Indeed, many seniors tell themselves that when Washington pours extra cash into the New Deal pension program, the action is something like investing in a new Volvo. The purchase may look extravagant but is, in reality, deliciously necessary. This attitude is also held by some of our most respected pension officials. The longtime Social Security Administration commissioner Robert M. Ball wrote on this page recently that "it's the essence of responsibility, in my view, to insist on no benefit cuts" ["A Social...