A Harvard psychologist explains the rise in passengers getting violent on airplanes and customers abusing retail workers: People have reached 'a boiling point'

Passengers board an American Airlines flight from California to North Carolina.
Photo by Sandy Huffaker/Getty Images
Passenger violence on airplanes is spiking and retail workers are experiencing customer harassment.
Fear and anxiety activates the fight-or-flight part of our brain, a Harvard psychologist said.
Now, after a year and a half of being on edge, many people are reaching a "boiling point."See more stories on Insider's business page.
Violence on airplanes is spiking. Retail and fast-fo