To be fair, you aren't supposed to resist in a school much less with firearms and even less with automatic weapons.
In a perfect world, right?
The original point was saying that in order to bring an AK-47 in, you'd have to sneak it in. But if there's no resistance, why would you have to sneak it in?
Even our police which is corrupt as forget can be dependable when it comes to lives.
The fastest average police response time in America is Nashville with 9 minutes. Over-all average for the USA is 10 minutes. 10 minutes of unimpeded machine-gun fire is disastrous, one way or the other. And that's just the response time, it'll be another amount of minutes before tactical comes breaking down doors. But by this time, the shooter would've probably capped himself.