The accidental discharge is just one of my concerns. Take Switzerland, for example.
Switzerland is often held up by gun rights activists as a shinning model of a country with a strong gun culture but low violent gun crimes. While this is true, the Swiss also lead all of Europe in gun suicides. The reason is clear -- when you are in a mentally unstable state, enough to consider suicide, you reach for the most convenient method to kill yourself -- the gun. People who commit suicide often go for a quick or painless method to do so. But if you swallow a bottle of tylenol, there is plenty of time to change your mind and have your stomach pumped. A bullet to the head doesn't offer much time for introspection.
Where am I going with this ? The point I'm making is that introducing guns into the hands of civilians in a sensitive place with children is a dangerous and unpredictable proposition, especially when the problem we are trying to combat -- the THREAT of a school shooting -- remains extremely low. A teacher with a gun could accidentally discharge the gun, or he could blow his head off when he finds out that his wife is cheating on him, or he could snap and shoot a student that's giving him lip. The likelihood of any of this happening is extremely low, but it isn't any less likely than a heavily armed shooter storming your school. And while accidents and mistake happen, most accidents and mistakes can be rectified. It's much harder to take back a bullet.
