They can get it wrong time after time after time, but when things appear most dire it is almost like a defense mechanism this running back to “home” the Yellen’s, Bernanke’s, and Powell’s. The world looks like it is falling apart leading a central bank, any central bank to try something and for a time it appears to work. It never does.
......This is where we are in January 2019. Powell after being unshakably confident about the US economy in particular he has said all the right things this month. His dove is as chicken as chickens can get (until whatever comes next comes next).