"I'm no historian," said Harry. "But morals are morals. What's unethical here and now is unethical anywhere, anytime. "Kane, you're wrong. It is ethi… - Larry Niven

"I'm no historian," said Harry. "But morals are morals. What's unethical here and now is unethical anywhere, anytime.
"Kane, you're wrong. It is ethical to execute a man for theft?"
"Of course."
"Did you know that there was once a vastly detailed science of rehabilitation for criminals? It was a branch of psychology, naturally, but it was by far the largest such branch. By the middle of century twenty-one, nearly two-thirds of all criminals could eventually be released as cured."
"That's silly. Why go to all that trouble when the organ banks must have been crying for — Oh. I see. No organ banks."