That's like when Archie Bunker said to that the only way to prevent airplane hijackings was to arm your passengers.

Now as far as teachers carrying guns on school grounds: Are you quite certain that possessing a teaching certificate makes one mentally equipped to carry a firearm? Because, and I realize I'm 50 years old, but when I was a kid, we had some real wackadoo fucking teachers.

Plus, what does the nebbish, bookwormish teacher do when rushed for his/her weapon?

Maybe you were joking, but that's a ridiculous idea. Just my opinion.