Okay, this is more of a philosophical question and less of a "would you rather," so it will be less gross but harder to answer.
You find yourself in a locked room with a killer and two innocent people. The killer tells you have two choices. You can do nothing and he will kill both people and you can go free or you can kill one of the people and you and the survivor can go free. Which do you choose? Do you participate in something terrible to save someone or do you refuse to kill a person out of principal and let more people die?
I'd like to know how you answer.