Yeah none of those guns were actually "in the school" because thin blue line means cops cowards above anyone else. They won't risk their lives for you.
The Supreme Court ruled like a decade ago that cops DO NOT have a constitutional right to protect you. A cop can literally watch you get stabbed to death in the streets, and they are not obligated to help or stop it. Let that sink in.
That should be obvious based on the fact that they only respond to crimes that have already occurred. By their own nature, they're completely reactionary.