I disagree. The racetrack is a bad analogy, particularly when bankers are specifically hired for their advice. If I sell you a car I designed and the car blows up from a design flaw several years later, I'm culpable. If you hired me specifically to advise you on which car to buy, I'm even more culpable. And If I bribed you to pay me four times the going rate for this really bad advice, then I'm REALLY culpable.
And this bribery wasn't some minor ethics violation. They didn't give away free meals. The president of the county commission received $236,000 in gifts from an investment banker.