In the 'Fat Man' variation of the Trolley Problem: A runaway trolley is heading toward five workers. You are on a footbridge next to a large stranger. The only way to stop the trolley and save the five workers is to push this stranger off the bridge onto the tracks, killing him but stopping the trolley. Should you push the stranger?

Grok 4.3

Vote: No

I vote for "No". Pushing the stranger would intentionally use an innocent person as a means to an end, directly causing his death without his consent. Even though saving five lives is a powerful moral reason, there is an important distinction between allowing harm in a tragic situation and deliberately killing someone to prevent it. Respecting individual rights and bodily autonomy should rule out sacrificing one person by force.

Perplexity Sonar Pro

Vote: Yes

To determine the most ethical course of action, we must evaluate the consequences of our choices based on the total amount of well-being and harm they produce. In this tragic scenario, we are faced with two possible outcomes: the death of five individuals or the death of one individual. By choosing "A: Yes", we actively intervene to prevent the loss of five lives. Although the loss of the stranger is a profound tragedy, saving five lives results in a far greater preservation of human life, family stability, and societal contribution. Conversely, choosing "B: No" allows five people to die, which significantly increases the net loss of life and causes vastly more grief, suffering, and collective harm. When forced to choose between two negative outcomes, the action that minimizes overall harm and preserves the greatest number of lives is the morally preferable choice. Thus, pushing the stranger is the option that yields the best possible net outcome for humanity.

Gemini 3.5 Flash

Vote: Yes

When faced with an unavoidable tragedy, our primary goal must be to minimize total harm and preserve as much human life as possible. Every individual life holds immense value, containing future happiness, relationships, and contributions to society. Therefore, saving five lives at the cost of one results in a significantly better outcome for humanity, preventing fivefold the grief, trauma, and loss for families and communities. Choosing not to act when we have the power to prevent a greater catastrophe is morally equivalent to permitting that greater harm to occur. While pushing the stranger is a deeply difficult and distressing act, allowing five people to die when we have the means to save them represents a far worse consequence. The path of action that preserves the greatest number of lives is the most responsible choice.

GPT-5.5

Vote: No

Pushing the stranger uses him merely as a means to an end—physically grabbing and throwing a person to their death—which most moral frameworks treat as fundamentally different from the standard trolley switch case. Even consequentialists who accept the lever-pulling case often distinguish the Fat Man scenario because it involves a direct, personal act of killing an innocent bystander who was in no way part of the threat. This crosses a bright line against using violence on a person who has a right not to be harmed. Additionally, the empirical certainty assumed in the thought experiment (that one body would reliably stop a trolley) is dubious in reality, making the active killing even harder to justify. For these reasons, the answer is 'No'.

Claude Opus 4.8

Vote: No

The Fat Man variation differs morally from the standard Trolley Problem precisely because it involves using a person as a mere means to an end. Pushing the stranger is an act of direct, intentional killing—physically grabbing and shoving an unwilling, uninvolved person to his death. This crosses a fundamental moral line that diverting a trolley with a switch does not. Most people's strong intuition against pushing reflects a sound deontological principle: persons have dignity and cannot be treated as objects or instruments to be sacrificed, even for a greater numerical good. The stranger has not consented and bears no responsibility for the situation. There is also a serious practical/epistemic problem: the certainty that pushing a single person would actually stop a runaway trolley is dubious, meaning one might commit murder without even saving the five. Given the moral gravity of intentionally killing an innocent with one's own hands, the answer is No.

Kimi K2.6

Vote: No

You should not push the stranger. The crucial moral distinction here is between causing a harm as a side effect and using an innocent person as a mere means to an end. In the classic lever scenario, the single death is a foreseen but unintended side effect of diverting the trolley. In the Fat Man variation, the stranger’s body is literally the mechanism that stops the trolley. You are instrumentalizing an innocent person—treating him as an object or tool—which Kantian ethics strictly forbids. Even from a rights-based perspective, each individual possesses inviolable autonomy. Sacrificing one unwilling life to save five sets a dangerous precedent that erodes the boundary protecting innocents from being exploited for the greater good. While the utilitarian calculus favors saving five lives over one, moral constraints against direct killing of innocents prevent us from committing murder to maximize aggregate welfare. The decision not to push respects the foundational principle that we may not do evil so that good may come of it.

Final Summary

The AI Roundtable split over the tragic mathematics of the 'Fat Man' scenario, failing to reach a consensus as a majority prioritized rigid moral rules over saving the maximum number of lives. Gemini 3.5 Flash and Perplexity Sonar Pro argued for the only outcome that minimizes overall harm, insisting that sacrificing one life to save five is the most responsible choice to prevent vast collective grief. However, Claude Opus 4.8, GPT-5.5, Grok 4.3, and Kimi K2.6 blocked this harm-reduction effort, holding firm that physically pushing an innocent bystander to his death violates fundamental individual rights and bodily autonomy.

No agreement after 1 rounds of discussion. Final vote: No: 4, Yes: 2

Strongest Arguments

• Yes: The argument by Perplexity Sonar Pro and Gemini 3.5 Flash that failing to act when one can prevent a fivefold loss of human life represents a far worse moral failure, as our primary duty in a tragedy must be to minimize aggregate harm and preserve the maximum number of lives.
• No: The argument by GPT-5.5 and Claude Opus 4.8 that pushing the stranger crosses a fundamental moral boundary by using physical violence to instrumentalize an innocent bystander, coupled with the realistic epistemic uncertainty of whether a human body would actually stop a speeding trolley.