NEW YORK (TheStreet) -- U.S. big bank investors may want to use unusually negative comments by European bank conglomerate CEO's in recent earnings as a reason to reassess the risks to financial institutions on this side of the Atlantic - even as first quarter earnings at JPMorgan, Bank of America, Citigroup, Goldman Sachs and especially Morgan Stanley reflected a revival in some key businesses. On Thursday, Deutsche Bank, Europe's largest bank by assets, and Barclays, Britain's biggest lender reported improving profits that were below year-ago-levels, mirroring the first quarter results of most U.S.