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Why do groups of people inflict violence on unarmed neighbors? (Germany, Rwanda, Darfur, Nanking....). Here's the neuroscience point of view.

Why do groups of people inflict violence on unarmed neighbors (think Germany, Rwanda, Darfur, Nanking....)? How do ingroups and outgroups form, neurally-speaking?  How does social context and obedience to authority navigate mass behavior?  

Here's my take on these questions, through the lens of neuroscience.

{videobox}KXeJQ2YSLMo|1. Introducing social neuroscience|,
SiXhZdO7AHM|2. Syndrome E - violence and group contagion|,
TDjWryXdVd0|3. What makes us empathetic?|,
7KsAFALdp2w|4. Peer pressure and obedience to authority|,
M-8PB6ZJgOM|5. Re-humanisation and how we can curb violence|,
kO9n_99Fw9A|6. Q&A: David Eagleman on the science of de- (and re-) humanisation{/videobox}