Key words there, “should at LEAST have…”.
Keep in mind we now have rapid access biometric safes that can be opened instantly with your fingerprints or retina scan.
There’s definitely an argument for an extra measure of security in schools above and beyond normal civilian carry.
I may not fully agree with it, but I understand the argument.
A teacher with a well secured biometric handgun safe on say their desk or in plain view at the back or the room would have almost as quick access as someone carrying on their person.
I’d argue that having the handgun safe on the desk and a secure locker at the back of the class with a long gun in it might be in fact idea.
We’re not training faculty and staff to be swat teams or to go hunting school shooters for the most part, we’re simply talking about giving them a means to defend themselves and their kids in their classrooms should such a shooting take place.