Pretty sure a bulletproof room also just conveniently gathers victims. Either everyone's going to know the code to get in including the aggressor/shooter, or no one will know it but a few people will know and the room will simply not be effectively used.

After reading the article...

>Once the door is secured, no one can access it from the outside.

Great, so the first person who gets there will probably be terrified, shut the door, and everyone else with run to the door not realizing it's already closed/locked. Or the shooter might prioritize going to that room and using it as a fallback/safety point by shutting themselves in.

This is just a non-solution, stuff like this never works out well when you're depending on a bunch of random, terrified people and children to use it correctly. Also apparently assuming the aggressor/shooter will magically not know the room exists or target it specifically. Since it's not about keeping kids safe, I'd imagine either a "friend" is getting a contract to build it, or it's some dumb political move by someone who should never lead or be in office.