peer pressure. that’s how they do it in the military: one guy’s a F-up, the whole company loses its weekend leave.
Scaramucci's of Italian stock and he no doubt knows why Roman Legionnaires seldom showed cowardice. For every act of cowardice during fighting action, ten Legionnaires would be executed i.e. "decimated." Since the executees were chosen at random, every fighting man had a very personal interest in making sure his comrades didn't cut and run.