For 10 points, name this phenomenon in which onlookers amidst wrongdoing generally do nothing.
John Darley and Bibb Latané once demonstrated this phenomenon using an experiment involving smoke slowly filling a room. One of the factors influencing it is diffusion of responsibility, which provides evidence for why it is more prevalent when larger populations are present. Good Samaritan laws attempt to reduce this phenomenon, one famous example of which include Winston Mosely's murder of Kitty Genovese. For 10 points, name this phenomenon in which onlookers amidst wrongdoing generally do nothing.
John Darley and Bibb Latané once demonstrated this phenomenon using an experiment involving smoke slowly filling a room.
{Bystander Effect}