Simply put, the financial crisis of 2008 was caused by a lot of banks making a lot of loans to a lot of people who either could not or would not pay the money back. But this explanation raises two key questions. Why did private lenders, whose job it was to assess credit risk, make those loans? And why did the army of financial regulators, with massive enforcement powers, allow 28 million high-risk loans to be made?

There's a strong case that the answers can be traced to Sept....