They are masters in shifting responsibility. See “ECB’s Nowotny: Don’t Blame Central Bankers for Low Rates”:
The low interest rate environment has more to do with economic developments, rather than the autonomous actions of central banks, said European Central Bank Governing Council member Ewald Nowotny in a speech Thursday. He added that in this environment it was difficult for a central bank to set interest rates on its own.
Speaking at a conference in Alpbach, Austria, Mr. Nowotny said that one of the factors keeping inflation down is globalization. Low prices are “an advantage for consumers, but puts pressure on wages,” he noted.
Moreover, growth is also relatively low. “We have a trend of long-term, low growth rates, which is not easy to interpret,” he said.
In his pre-Jackson Hole ‘manifesto’: John Williams shows this chart
The underlying determinants for these declines are related to the global supply and demand for funds, including shifting demographics, slower trend productivity and economic growth, emerging markets seeking large reserves of safe assets, and a more general global savings glut.
Although the main reason was starring him in the face, it is never acknowledged. And that reason is the simultaneous crash in NGDP, resulting from sweeping the monetary policy framework pursued during the great moderation under the rug, first by the Fed, immediately followed by the other nincompoops.