The Occupy Wall Street protests have reintroduced a recurring character in our national economic drama: the struggling young college graduate. Every time the economy goes south, we hear from the Harvard-educated bartender, the taxi driver with a master’s degree in art history, or the philosophy major who’s moved back in with his parents, shipping out résumé after fruitless résumé. As Ezra Klein recounts in the Washington Post, many of the Occupy Wall Street protesters cite their college loans as a source of their grievances: “College debt represents a special sort of betrayal. We told you that the way to get …