Some years ago, Philippa Foot drew attention to an extraordinarily interesting problem." Suppose you are the driver of a trolley. The trolley rounds a bend, and there come into view ahead five track workmen, who have been repairing the track. The track goes through a bit of a valley at that point, and the sides are steep, so you must stop the trolley if you are to avoid running the five men down. You step on the brakes, but alas they don't work. Now you suddenly see a spur of track leading off to the right. You can turn the trolley onto it, and thus save the five men on the straight track ahead. Unfortunately, Mrs. Foot has arranged that there is one track workman on that spur of track. He can no more get off the track in time than the five can, so you will kill him if you turn the trolley onto him. Is it morally permissible for you to turn the trolley? Everybody to whom I have put this hypothetical case says, Yes, it is. 2 Some people say something stronger than that it is morally permissible for you to turn the trolley: They say that morally speaking, you must turn it-that morality requires you to do so. Others do not agree that morality
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