"I'm buying a retirement villa in Antarctica."
"How much longer for you?"
"Eighteen years."
"Well, someone's got to do it."
"But why me? And why no Earth leaves?"
"You've watched the tapes, you know why. Crime is a disease. It's infectious."
"So what?"
"So if you work around criminals, you run the danger of infection. You might contaminate someone on Earth."
"It isn't fair...."
"Can't be helped. Those scientists know what they're talking about. Besides, checkpoint's not so bad."