This isn't revenge, it's punishment.
No, it's revenge. Suppose you break into a house and steal some stuff. You get caught, the court finds you guilty. Does the court break into your house to steal your stuff to "show you what it's like"? No, they send you to jail. Suppose you are caught drunk driving. Does the court sentence you to be a passenger in a car with a drunk driver? No, you go to jail. Suppose you rape someone, does the court sentence you to be raped? No, you go to jail.
We send people to jail for two reasons. To punish them by isolating them from society. And to protect society by taking these people off the streets. As Geof points out, "punishment by death" is absurd, because punishment is about teaching someone to act a certain way. If you kill them or torture them, it's not punishment, it's revenge.
Don't get me wrong, it's human to thirst for blood and revenge. But you shouldn't give in to your base instincts, it's not what civilization is built on. You should ask yourself what should we do with this person to promote civilization, not "when I get my hands on him, I will...". Yes, no doubt you would. But justice is not a tool for you to exert your revenge.