We can, however, just by removing the existing gun-free zone restrictions in schools, essentially get some level of security "free".
As a parent, I'm not really interested in encouraging more guns around schools just to get some discount "security" by wannabe cowboys.
You trust the faculty of your school with your child's well being every single day Joph. We're not talking about random strangers here. In the grand scheme of things, your child is going to be vastly more affected over the course of his life by a million other actions and decisions his teachers make than whether some of them keep a firearm in a locker in the faculty lounge. Which, hopefully, he'll never even know anyway.
It's a irrational fear.