The basic scenario describes a runaway trolley on course to collide with and kill five people down the track. The people are unable to move, and the trolley is headed straight for them. But you, as a bystander, can intervene and divert the trolley to kill just one person on a different track. You are standing next to a lever in the train yard. If you pull this lever the trolley will switch to a different track and avoid hitting the five people. However, there is one person on the track you will divert the trolley to. Your options are: Do nothing and allow the trolley to kill the five people on the main track or pull the lever to divert the trolley to a secondary track where it will kill one person.
What is the right thing to do? Or more technically, which is the more ethical option to follow?
Philosopher Philippa Foot introduced this genre of decision problems in a 1967 paper and many variations have been introduced since. One variation you may find more challenging posits that the one person on the secondary track that will, or will not, be sacrificed is your own child. What then?
Another interesting variation sets the problem as before, with a trolley racing towards five people but you are on a bridge under which the trolley will pass. You can stop the trolley by placing something heavy in front of it. In this variation there is a very fat man next to you on the bridge. You can stop the trolley by pushing the fat man over the bridge onto the track. This action will save the five but kill the fat man. Should you, do it?
It turns out that most people that would pull the switch will not push the fat man to save the five. Is there a significant moral distinction between the two variations?
Interestingly, trolley-type issues have arisen in the ethics of designing self-driven vehicles which require programing of whom or what to strike when a collision appears unavoidable. Should the vehicles software place more, or less, value on the safety of the car’s occupants or on the safety of potential victims outside the car. Would you be willing to purchase a self-driven car programed to sacrifice yourself in an accident situation? What would be the marketing line? Automakers are currently dealing with these topics.
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