Obama too had to clean up a mortgage crisis from his predecessor's careless deregulation. Not an excuse for his own crimes, like say drone striking US citizens. But Trump is just openly corrupt, inept, praising autocrats and aspiring to be one.
People give Obama a pass when they shouldn't. This stuff didn't start with Trump. The problem goes back much further.
No need for false equivalence.
In that environment ZIRP was the only solution. Ben Bernanke (a Bush appointee, re-appointed by Obama) devoted his academic career to how the Fed could have prevented the Great Recession. He was right.