Here's a quote:
My mind keeps going back to the eternal question about the Jews and the Nazi death camps: “Why did no one resist? Why did no one fight?” The answers to these questions would probably be as baffling and heartbreaking as anything else about the story itself. In his superb book Ordinary Men, Christopher R. Browning tells of how during the Nazi terror in Poland, 8,000 Jews were loaded onto a train that was overseen by only 20 guards. Can you imagine this? That crowd of humans--even if only a quarter of them were of hearty health to resist--could have CRUSHED the guards, but they did not. Why do American students not rat-pile active shooters? Because they are told to be passive, to hide, to run, to hope for mercy or the dumb luck of the numbers that they will be missed by the shooter. When the subject comes up on campus, I ALWAYS tell my peers that if something like that happens near me, if I am a student or a teacher, I will do my damnedest to get to the shooter from behind and claw their eyeballs out.