Why aren’t these guys in jail?

Rolling Stone: “They weren’t murderers or anything; they had merely stolen more money than most people can rationally conceive of, from their own customers, in a few blinks of an eye. But then they went one step further. They came to Washington, took an oath before Congress, and lied about it.”

Can someone please, please, explain to me why these thieves aren’t serving time? It’s time to pay the piper.