Susan Estrich, a smart politico who taught Elliot Spitzer in law school, concludes that this is why a man so smart could do something so stupid:
"There is only one obvious explanation for why a smart man would commit such a totally self-destructive act: He didn't think he would be caught."
This could be so. Still, my inclination is to think that it is something else. He is a sometimes sanctimonious, sometimes bullying crusader. I think such a man might do something so wrong, catchable, career-ending, and humiliating because he thinks, subconsciously, that he is a fraud.