This series of events just points up the fact that neither Dodd-Frank, nor any other piece of legislation or regulation, has done much of anything to eliminate the perverse incentives that have existed for some time in the financial services industry.
A few decades ago, investment banks that undertook the greatest risks were generally organized as partnerships where guys were dissuaded from placing very large, risky bets -- since losing them might mean facing the inability to maintain a lifestyle involving possession of mansions, yachts, airplanes, etc. Not anymore! People can play high-stakes "heads I win, tails somebody else loses" games with other people's money, in some cases taxpayers' money.
Although I'm not familiar with the deal structure of Corzine's contract, I have little doubt that it offered him very large bonuses if he could show some flashy short-term earnings statements. That's sort of the way it usually works nowadays. Of course, the downside is that it incentivizes some folks to make bets they would never make with their own money. If the worst that can happen to you is that you get tossed out after losing a bunch of money, albeit after collecting a few million bucks of salary income, but you figure that you stand a fair chance of making ten times that (or more) in bonuses if you swing for the fence, you might take risks that seem insane to everyone else.
This was just an unusally risky way of playing the carry trade. Some institutions have been borrowing at near zero percent and buying safer longer-dated U.S. Treasuries, secure in the knowledge (especially if they deem themselves "TBTF") that Treasury and the Fed will backstop them against catastrophic portfolio losses in the event that long rates skyrocket. MF Global was obviously not TBTF, and Corzine probably thought a riskier strategy offered the best shot at a huge payday. Oops!
Of course, he obviously didn't figure that somewhere amid all the chaos, $1.2 billion would simply go missing from customer accounts. Extremely bizarre. But I doubt seriously that Corzine was involved in any nakedly criminal act involving misappropriation of funds, since by all acounts he is still a wealthy man, having made several hundred million dollars during his Goldman stint. After all, why would a wealthy man risk a prison term?
However, he certainly should have had a better handle on just what in the hell was going on at MF Global, whatever it was, and for that he has a lot to answer.