The bond market fell this week, wiping out gains for the year. Some blame it on Mario Draghi’s comments after an ECB meeting in which he expressed indifference to volatility in bond markets. If it is true that Draghi’s statements motivated the selloff, it shows how fragile is an investing philosophy that is based solely on what central banks do. Such investors are terrified of rising interest rates but want to remain fully invested until the last bell. Of course, anyone investing in bonds or stocks at these altitudes should be as nervous as a long-tailed cat in a room full of rocking chairs.