1. The Bystander Effect

2. The Bystander Effect
Social psychological phenomenon in which individuals do not offer help in an emergency situation when others are present.

3. Seinfeld Bystander Effect

4. "Genovese Syndrome" Most famous case of the bystander effect ever
Kitty Genovese was stabbed to death in The murder continued for half an hour while thirty-eight bystanders watched without intervening or notifying the police.

6. The Holocaust
The Holocaust is a great example of the bystander effect because the towns and cities near the concentration camps knew fully well of the atrocities and horror inside the camps. These citizens could smell the camps from as far as twenty miles away before finding them. Therefore, the mayhem could not be ignored. The populations made no effort to stop the torture, yet they were forced to clean up the corpses and bury them in mass graves.

7. Social Psychological Disorder
[Germans] were also victims of cultural ethical relativism, believing that if their government thought that [genocide] was ethically relative behavior in their culture, then they should comply.
In other cases, with more people, individuals are less likely to take responsibility. They assume that someone else will intervene.
Heil Hitler: Confessions of a Hitler Youth (film)
(1991) Philosophical Ethics, An Introduction to Moral Philosophy, Second Edition

8. "First they came for the communists, and I did not speak out— because I was not a communist; Then they came for the socialists, and I did not speak out— because I was not a socialist; Then they came for the trade unionists, and I did not speak out— because I was not a trade unionist; Then they came for the Jews, and I did not speak out— because I was not a Jew; Then they came for me— and there was no one left to speak out for me."
Martin Niemöller

9. Factors That Reduce The Bystander Effect
Bystanders know one another.
Witnesses have special bond to the victim.
Bystanders think that the victim is especially dependent on them.
Bystanders have considerable training in emergency intervention.
Witnesses have knowledge of the bystander effect.

10. Experimenting
Researchers stage an emergency situation to test the bystander effect.
Examples of these situations include epileptic seizures, women falling and becoming injured, or smoke pouring from an air vent. Once they have staged a condition they measure how long it takes until participants or bystanders intervene.
Results to these experiments almost always conclude that the presence of others restrains the willingness to help.

11. Drew Carberry, A director on the National Counsel of Crime Prevention
“If you are in a crowd and you look and see that everyone is doing nothing, then nothing becomes the norm.”
Drew Carberry, A director on the National Counsel of Crime Prevention