Tom: Capital punishment is stupid. You can’t prove killing is wrong by killing.
Harry: How do propose kidnappers should be punished?
Tom: They should be put in prison.
Harry: Doesn’t putting someone in jail seem a lot like kidnapping to you?
Tom: No. Why?
Harry: I mean, sending someone to jail for kidnapping means you’re forcibly taking someone and locking them up as punishment for forcibly taking someone and locking them up.
Tom: It’s different.