You have a terrorist and you have great many lives you can save. You have a choice. You can torture the terrorist or let a great many people die. You decide. Will you torture to try and get some info. Or will you let all those people die? You make the call.
Which is it?
We somehow fought the Germans and Japanese, among others, without the need to sanction torture of detainees as a legitimate interrogation tool.
Give a man a fish and he eats for a day. Teach a man to fish and he stops voting for the Free Fish party.