I'm not sure how safe I'd feel with a teacher having a gun.
I mean sure it would be great in case someone did decide to go in to a classroom and open fire but they could miss and there's even more possibilties that I'm sure I couldn't imagine. They could be a marksman, you never know.
Just because they're a teacher or something does not mean they're the smartest, honest or most trustworthy person in the world and believe me on that. There's always gonna be that bad apple.
Imagine this now, a student attacks a teacher and she pulls a gun to shoot him and misses and hits little Suzy. I'm just saying not the best case scenario. Hows about more security officers in schools. Get two three hell 4 more in there.
Now imagine a gang of terrorists walking in a building and taking a school hostage, enough that Administration is outnumbered. That's just not the solution.