This completely glosses over the periods of times, in some cases decades, where none of those things happened. The Cold War was winding down when I started school and we never did a duck and cover. I graduated the year Columbine occurred so they didn’t institute active shooter drills till after. I’m in one of the lucky few age ranges where my biggest anxiety at school was bullies. This period of school my kids are in is very much worse than when I was in their equivalent grades.