I think the original point was that 30 or 40 years ago we didn't need security guards and metal detectors in schools.
What changed and how did we get to this point?
30-40 years ago we had shotguns in our trucks to go hunting before school too…what changed…mental illness. We went from treating and excluding mental illness to celebrating it, normalizing it, and even encouraging it. Now people wonder why people with mental illnesses are shooting up schools.