Powell has been idolized by the Left for one reason: He's been a thorn in the side of President Donald Trump for years. His job, as former World Bank president David Malpass notes, should be "to defend the dollar and keep it stable in value." Powell's defenders counter any criticism of the Fed by reflexively arguing that the central bank should be independent. Under Powell's reign of error, the central bank has been neither. Powell should admit he's in over his head and exit stage left now before he does more harm.