Bystander effect
The bystander effect (also called bystander apathy or the Genovese effect) is a social psychological theory that states that individuals are less likely to offer help to a victim in the presence of other people. The theory was first proposed in 1964 after the murder of Kitty Genovese, in which a newspaper had reported (erroneously) that 37 bystanders saw or heard the attack without coming to her assistance or calling the police.