Five years have passed since the onset of what is sometimes called the Great Recession. While the economy has slowly improved, there are still millions of Americans leading lives of quiet desperation: without jobs, without resources, without hope. Who was to blame? Was it simply a result of negligence, of the kind of inordinate risk-taking commonly called a “bubble,” of an imprudent but innocent failure to maintain adequate reserves for a rainy day? Or was it the result, at least in part, of fraudulent practices, of dubious mortgages portrayed as sound risks and packaged into ever more esoteric financial instruments,...