If you think aficionados of a living Constitution want to bring you flexibility, think again. You think the death penalty is a good idea? Persuade your fellow citizens to adopt it. You want a right to abortion? Persuade your fellow citizens and enact it. That's flexibility.
The death penalty? Give me a break. It's easy. Abortion? Absolutely easy. Nobody ever thought the constitution prevented restrictions on abortion. Homosexual sodomy? Come on. For 200 years, it was criminal in every state.
You can't come in smugly and with great self satisfaction and say 'Oh it's torture, and therefore it's no good.' Is it really so easy to determine that smacking someone in the face to determine where he has hidden the bomb that is about to blow up Los Angeles is prohibited in the constitution? It would be absurd to say you couldn't do that. And once you acknowledge that, we're into a different game.