This is an example of the bystander effect. According to a social psychological hypothesis known as the "bystander effect" or "bystander apathy".
bystander effect - in this people are less inclined to help a victim when other people are around. It mentions how the presence of other people can make someone less eager to help a person in need.
According to research, even in an emergency, a bystander is less likely to offer help when physically or mentally surrounded by people than when alone. Additionally, the size of the group plays a role in how much help is provided, although the impact of each additional bystander decreases.
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