UPDATE: In Sunday's New York Times: F.B.I. Struggles to Handle Wave of Financial Fraud Cases

ORIGINAL: If, as some free market and other commentators persistently claim, the worldwide financial crisis was caused by reckless home buyers knowingly abusing cheap mortgages they couldn't pay, why does the Washington Post report today that

Lehman Brothers, the giant investment bank that last month filed the largest bankruptcy in history, is the subject of at least three federal criminal investigations that have subpoenaed a dozen top executives, according to a person familiar with the matter. [...] and [...] Lehman is one of at least 26 firms being examined by federal authorities investigating potential fraud and wrongdoing in connection with the worst financial crisis since the 1929 stock market crash.