There is more to motive than meets the eye. These school officials might claim to have staged this “drill” for practical purposes, but I have no doubt they were partly motivated by sadistic tendencies.
The punishment must be severe.
the staff played a prank on the kids, convincing them there was a gunman on the loose.
A teacher wearing a hooded sweatshirt pulled on a locked door, pretending to be a suspicious subject in the area.