Imagine that you are an inmate within a concentration camp; a sadistic guard generates a moral issue for you.  The guard caught your son trying to escape from the concentration camp, and he is going to hang him.  He wants you to pull the chair from underneath your son; the guard claims that if you do not pull the chair, he will kill some other innocent inmates additionally.  You do not doubt the word of the guard, regarding the death of the other inmates.  What do you do in this moral dilemma?  Does your choice change depending on who the other inmates are or how many of them will die?