Sure, why not? Maybe have a mine field too so that students don't run on the hallways. And of course the director could be a SWAT member instead of a teacher. Another interesting idea is to give the cleaning ladies some firearms and a couple of katanas for close distance use. Sounds great!
Is this what the teachers represent nowadays? When you can't convince someone to act well resort to violence? It goes against all of society's morals and beliefs. Besides that though, it is not practical either. Teachers are not trained to use them. Guns are made to kill people. If one is not trained well there will be many sad consequences. And I do not think that teachers should train in war...
Amidst the ruins of the ancient city I stand now baffled by the blazing battle fought in front of my bare eyes... oh man how much anime did I watch last night!