I don't even think one needs to reach for extreme incidents to show the underlying animal nature of humans. From the far more mundane shopping frenzy of https://en.wikipedia.org/wiki/Tickle_Me_Elmo : "The scarcity of the new toy provoked a shopping frenzy. Two women were arrested in Chicago for fighting over the doll, while in New York City some people ran after delivery trucks hoping to get their hands on Elmo before it reached stores. ... Robert Waller, a clerk working at a Wal-Mart store in Fredericton, New Brunswick, Canada, was among those injured by 'Elmo-mania'. During a Midnight Madness sale on December 14, Robert was unpacking the latest shipment of Tickle Me Elmo, when he became uncomfortably aware of a crowd of about 300 people watching him carefully. He opened a box, pulled out an Elmo - and the crowd stampeded down the aisle. Trampled, he suffered 'a pulled hamstring, injuries to his back, jaw and knee, a broken rib and a concussion'." It was supremely silly but the incidents of hooliganism across the U.S. were real.