" People in crowds often act in thoughtless ways—shouting profanities, destroying property, throwing bricks, threatening others. This can come about partly because of a process known to psychologists as deindividuation : people begin to lose their self-awareness and sense of individual agency as they identify more strongly with the group, which often leads to antisocial behaviors they would never consider if they were acting alone. They can form a mob, cease to think for themselves, lose their moral compass, and adopt a classic us-versus-them stance that brooks no shared understanding. "

― Nicholas A. Christakis , Blueprint: The Evolutionary Origins of a Good Society