I seriously don't even know. I'm from a teaching family with a strong military and religious service background (oddly, not as far apart from each other as you might think!). Not only are 'more guns' not the answer, but the sort of training you'd need to even BEGIN such a program--not just physically, but mentally preparing students and staff to maintain a high alert in the event of an armed response... That is not a road you want to go down, not at all.

It's not even an issue of 'can they use them,' any idiot can pull a trigger, it's 'can they use them well' and the answer to that question is no. Military and police are specifically trained to operate in combat situations and they still cannot say that every single one of their trainees are going to react with appropriate force in combat. The point of their intense training is to give them an edge up on Fight/Flight; it doesn't erase the urge.