The who knew?" defense [was] thrown down by financial institutions and their senior executives to ward off accusations that they were somehow responsible for the disaster that befell the country. That defense is now crumbling by the day, thanks in part to their own employees' admissions. Citing internal e-mails, California joined the federal government and 15 other states this week in filing multibillion-dollar civil fraud lawsuits against the nation's leading credit ratings agency, Standard & Poor's, for allegedly deliberately "downplaying and disregarding the true extent of the credit risks" of the financial instruments it had rated as rock-solid. S&P says the charges are "without factual or legal merit," while adding that it, "like everyone else, did not predict the speed and severity of the coming crisis and how credit quality would ultimately be affected." Stack that up against an S&P executive who warned in an internal memo in December 2006, "This market is a wildly spinning top which is going to end badly." Or the 2007 e-mail from an analyst that read, "Job's going great, aside from the fact that the MBS (residential mortgage-backed securities) is crashing." Foreknowledge seemed to be apparent at JPMorgan Chase and Morgan Stanley as well. Internal documents in a lawsuit filed by Dexia SA, a French-Belgian bank, alleging "egregious fraud" by JPMorgan in the sale of $1.7 billion of mortgage-backed bonds, suggested executives at JPMorgan, Bear Stearns and Washington Mutual ... intentionally covered up the unworthiness of the securities they were selling.