This reminded me of a similar concept that I heard of a while back. Say that someone is going to kill 5 people, most would say it is justifiable to kill that person before they can get away with it (assume that killing them is the only way to stop them for the sake of this example). Saving 5 lives is worth the death of another. However, if 5 people were sick in a hospital, and all of them could be saved by various organ transplants, would it not be just as justifiable to kill a healthy person to save those 5 lives by distributing the donatable organs? Most would say no. But why is that?