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the claim

People fail to offer help in crowds because they assume others will help

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that people fail to offer help in crowds because they assume others will help?

Yes. Evidence robustly supports the social psychological phenomenon known as the bystander effect, where the presence of multiple onlookers leads to a diffusion of responsibility and a decreased likelihood of intervention.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

The analysis

The retrieved papers examine the bystander effect and confirm that population size and the presence of others introduce a diffusion of responsibility, making individuals less likely to offer help. There are no refuting studies in the provided set regarding this foundational psychological principle.

Evidence for · 2
Does gratitude moderate the bystander effect? A registered report.
2026
This study demonstrates the classic bystander effect, confirming that prosocial behavior declines and responsibility diffuses as the number of potential benefactors increases.
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R, O., YJ, T., & C, I. (2026). Does gratitude moderate the bystander effect? A registered report.. doi.org. https://doi.org/10.1080/02699931.2026.2699829

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More for · 1
Bystander effect emerges from individual psychological prospects.
2026
This paper models the bystander effect and supports the premise that individuals are less likely to help when others are present due to psychological mechanisms like diffusion of responsibility.
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T, N. & SM, C. (2026). Bystander effect emerges from individual psychological prospects.. doi.org. https://doi.org/10.1063/5.0323615

What does the evidence say?

The retrieved papers examine the bystander effect and confirm that population size and the presence of others introduce a diffusion of responsibility, making individuals less likely to offer help. There are no refuting studies in the provided set regarding this foundational psychological principle.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 7504 Aug 2026
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