Couldn't the police officers get their training without invading our public schools? The aim is to prepare our schools for the worst-case scenario, which is OK. The harsh realities have already been exposed to them. I guess what I'm trying to say is that government does things to give the people a peace of mind, to win votes, but in the end they really cannot protect you.They can blanket your eyes with an illusion of safety: security cameras, metal detectors, transparent backpacks, etc. There is always an end to tragedy, no matter how it begins. It will happen again, and again.