One explanation for the failure of people to come to the aid of a person in need, particularly when others are present, is

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Diffusion of responsibility is a phenomenon where individuals are less likely to take action or feel a sense of responsibility in the presence of a large group of people. This explains why people might not come to the aid of someone in need when others are present, as they assume someone else will take action.

One Explanation for the Failure of People to Come to the Aid