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Moral Dilemma: Would you be able to kill one person and save five?

 
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Last reviewed: 01.07.2025
 
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06 December 2011, 20:04

Imagine a runaway train with five people who are unable to get off. Now imagine that you can reroute the train in a different direction, killing one person but saving the five.

Would you do this?

This dilemma, posed by a team of scientists from Michigan State University (USA), is the basis for a new study of human moral principles. Participants in the study were placed in a digital 3D simulator and given the power to kill one person to save five.

The results? About 90 percent of participants activated the switch to reroute the train and violated moral rules to prevent the killing of five people.

"We found that the 'no-kill' rule can be broken for the greater good," said Carlos Navarrete David, the project's lead researcher.

The virtual model simulating the situation was as follows: the participant was on a train and had the right to choose the direction of the train using a switch. In front of him and to the right of him, as the train moved towards a steep ravine, five people were walking along the rails. And to the left - one person.

As the train arrived at a given point where people were located, participants could either do nothing and continue along the original route, ultimately killing five tourists - or activate a switch and redirect it to the left, killing one person.

Of the 147 participants, 133 (or 90.5%) activated the switch to change the train's route, hitting one person. 14 participants allowed the train to kill five tourists (11 participants did not activate the switch, and three activated it but then returned it to its original position).

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