Conservatives say, and this is one of their more successful memes, that poor people are immoral. The proles have sex and kids out of wedlock and expect us (i.e., upstanding middle- and upper-class patriots) to pay for them. They steal Medicare and cheat on welfare. They don't follow The Rules (rules written by, let's just say, not them). Which makes them Bad.
This was always hogwash, of course. Though it is true that poverty causes people to do bad things, class and morals are uncorrelated. But who's worse, the poor thief or the wealthy person who refuses to pay him a living wage?
America's professional class has traditionally enjoyed a privileged position at the top of middlebrow America's aspirational hierarchy. At the core of our admiration for doctors, lawyers and bankers was the presumption that these learned men and women adhered to strict codes of ethics. Doctors healed, lawyers respected the law and bankers didn't steal.