Which is a very important thing to remember at the moment, with the "war on terror" going on. A lot of people are making loud arguments that ANYTHING we do to ANYONE is okay because it's done in the name of saving lives.But realistically, the choice is never anything like as clear-cut as that...
After all, in a situation where you've seen a guy run out of a building right after setting a bomb and only he knows where the bomb is and you have only thirty minutes to defuse it, pretty much nobody is going to complain if you use 'torture' methods to get information out of him. (Of course, even then, it's a stupid idea to rely solely on making him talk, you should also be searching the damn building yourself.)
But the thing is, those situations pretty much don't happen except in fiction, where the writer can manipulate events for tension. And some people have trouble telling the difference between fiction and reality - a supreme court justice was apparently arguing that "You wouldn't want us to arrest JACK BAUER just because he had to torture information out of someone!" Well, yes, but that's 24, a ridiculously convoluted plotline crammed into a ridiculously short time period. It's NOT REAL.
We're all writers, we can all concoct scenarios in which you might 'need' to kill someone to prevent something worse happening. With a bit of thought we could probably come up with scenarios in which the hero thinks he/she needs to rape someone - hey, maybe there's this cult that sacrifices virgins so you have to frantically force sex on all the girls to protect them! (Wasn't there a horror movie with that plot?) But we have to remember that reality is rarely like that.