Oh, sorry, you must have missed this;
There were plenty of banks who pulled in their assets and started playing defense in 2006 - 2008. (hint, they didn't go bust). There was one US Car Company that strengthened it's liquidity in 2007-2008 (hint, the one which did not require a bailout). Ditto insurers vs AIG. Ditto a few housing developers.
But, what, they were all one-off outliers?
Or this;
"The Chair of the Board of Governors of the Federal Reserve System is the head of the central banking system of the United States. Known colloquially as "Chair(man) of the Fed", "Fed Chair(man)" or "Fed Chief". The Chair is the "active executive officer"[2] of the Board of Governors of the Federal Reserve System."
But for some nutty political reason, you need to defend Greenspan for fear of looking...um, ... thoughtful?