the phenomena is used to be known as "bystander effect" or "Genovese Syndrome."

anyone who thinks this a fake because everyone is standing around needn't look to far for examples of people failing to come to the aid of others ... remember the puerto rican day parade in new york a few years ago? ... still not convinced, look up Kitty Genovese ... she was murdered in New York in the late sixties after her killer attacked her outside her apartment, left and came back. Almost every one of her neighbors reported hearing the confrontation. Nobody called the police.