Credit rating agencies (CRAs) should return to their market roots and stop being a regulatory tool for public policy, according to a Moody’s Investors Services top executive. In recent remarks to the American European Community Association, Ray McDaniel, chief executive officer of Moody’s Corp., noted that credit ratings have grown from limited use by banks in the 1920s to something that regulators and politicians have relied upon to serve public-policy objectives for the past several decades. McDaniel said such reliance has got to stop. He said regulatory policies should be geared towards reducing any...