Central banks can never be held accountable for anything. In most cases, they cannot even be audited.
Central banks are audited to a borderline-silly level of redundancy in every major trading economy (i.e. the U.S., EU, Japan, UK, Canada and Switzerland).
Pentagon eats up trillions and no one has a clue. Trillions paid out in bank bailouts and no one questions. Billionaires take loans and declare bankruptcy...
Audits performed by those who are involved in the crime is hogwash.