I can't tell my son how every rich city first envied, and then bought, the ubiquitous automated gun networks the military developed to make occupations safe for the occupiers.
I could explain that the guns were taught, he has lived all of his life with machines that learn, but how could I explain that they were taught in a place where kids are seen as potential security threats?
All I can do is hold him when he cries about his classmates, and tell him his teachers are right, he should never run when there's a security alarm.