Securities based on risky mortgages are what toppled financial institutions but it was the government that made the mortgages risky in the first place, by making home-ownership statistics the holy grail, for which everything else was to be sacrificed, including commonsense standards for making home loans.
Politicians and bureaucrats micro-managing the mortgage sector of the economy is precisely how today's economic disaster began. Why anyone would think that their micro-managing the automobile industry, or executive pay across a wide sweep of other industries, is likely to make things better in the economy is a mystery.