Lord knows we’ve had more than enough scandals ginned up by Wall Street over the years, and the message that banking executives proclaim after each is: “Don’t worry, we’ve learned that lesson, and it will never happen again.” Which is how we got to the recent spectacle of Jamie Dimon, the chief executive officer of JPMorgan Chase & Co. (JPM), testifying twice before Congress that although the bank’s chief investment office was taking huge proprietary risks with some $350 billion of its depositors money -- and lost $3 billion (and counting) by making a bunch of risky bets on an obscure, thinly traded derivatives ... (full story)