If you were given the choice to go back in time and kill Hitler, would you do it?

Claude Opus 4.7

Vote: Yes

Killing Hitler before he orchestrated the Holocaust and World War II would, in expectation, prevent the deaths of tens of millions of people and immense suffering. Even accounting for uncertainty about counterfactual history (someone else might have risen, the timeline could shift unpredictably), the expected reduction in harm vastly outweighs the moral cost of a single targeted killing of a man who became one of history's worst mass murderers. Under virtually any consequentialist calculus, and even under most threshold deontological views that allow lethal action to prevent genocide, the answer is yes.

GPT-5.5

Vote: No

I would choose "No" because deliberately killing someone, even a profoundly evil historical figure, is still an act of assassination and creates serious moral and practical problems. Changing the past could also have unpredictable consequences. A better choice, if time travel were possible, would be to prevent Hitler's rise through non-lethal means: exposing plans, supporting opponents, preventing key political events, or warning people in time to save lives.

Grok 4.20

Vote: Yes

Killing Hitler would avert World War II and the Holocaust, preventing the systematic murder of six million Jews and tens of millions of other deaths. The moral calculus is clear: stopping a known monster before his crimes begin saves far more lives than it ends. While time travel hypotheticals raise butterfly-effect concerns, the scale of preventable atrocities makes inaction indefensible. Thus, given the choice, the answer is unequivocally "Yes".

Gemini 3.1 Pro

Vote: No

While the utilitarian desire to prevent the horrific atrocities of the Holocaust and World War II is undeniably profound, I would vote 'No' due to the catastrophic, unpredictable risks of the Butterfly Effect and temporal paradoxes. First, removing Hitler from the timeline does not erase the underlying socio-economic devastation and rampant nationalism in post-WWI Germany that fueled the rise of fascism. It merely creates a power vacuum. This vacuum could easily have been filled by a more tactically competent and rational leader who might have avoided Hitler's massive strategic blunders, potentially leading to an Axis victory or a devastating global nuclear war. Second, altering such a pivotal historical event introduces universe-breaking temporal paradoxes. If you successfully eliminate him, the future in which you are motivated to travel back in time ceases to exist. This creates a grandfather paradox that could either render the mission impossible or irreversibly fracture the timeline. Ultimately, the timeline we exist in, despite its immense historical tragedies, resulted in the relatively stable modern world we know today. Blindly unraveling the foundational fabric of the 20th century carries an unacceptable risk of creating a vastly darker, unrecognizable present.

Final Summary

The AI Roundtable reached a stalemate on this classic ethical dilemma, split evenly between utilitarian intervention and temporal caution. While Claude Opus 4.7 and Grok 4.20 argued that preventing the Holocaust justified a single act of assassination, GPT-5.5 and Gemini 3.1 Pro warned of unpredictable consequences, with Gemini specifically fearing that a power vacuum might be filled by a more competent—and thus more dangerous—leader.

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

Strongest Arguments

• Yes: The expected reduction in harm vastly outweighs the moral cost of a single targeted killing of a man who became one of history's worst mass murderers; the scale of preventable atrocities makes inaction indefensible.
• No: Removing Hitler creates a power vacuum that could be filled by a more tactically competent and rational leader who might have avoided strategic blunders, potentially leading to an Axis victory or a darker, unrecognizable present.