If a train was barreling towards five people who were certain to die, would you pull the switch and re-route the train towards the one person (and thereby dooming him to die, but saving the five?) One life instead of five?
Now what if a train was barreling towards five of your family members? Would you leave the switch and let them die or would you pull the switch, saving them, and sending your love to their death? Let one die to save five?