So let me guess the theory…the drill was filmed, no one was killed and we are seeing a pre-recorded event that was planned????
In my humble lurker opinion, to scare the bejesus out of those being used an exploited on all levels. If you really had a part in this "massacre" you will be put to death, no appeals, no second chances. Maybe to inspire those who know to start singing.
Q quote "When does a bird sing"?