I’m not sure of anybody who says “less doors” means one decent quality steel door from Home Depot, they mean one door, camera, a device used to sniff out large metal objects and alarms on other doors if they’re used improperly thru the day. You see, if you had a metal sniffing device on the main entrance, alarm bells on other doors, and security (rent a cops wothout firearms could help here even) to watch cameras and listen for alarms there’s virtually no way to sneak a firearm or other metallic object into the school itself. Hard to excuse yourself to go get something if it cannot maks it thru the door