[quote=Legend]
90% of your points are speculation. The only thing that would happen if we armed teachers would be that shooters get apprehended or shot immediately, 
[/quote]

This applies to society in general too, but I'm sure you are already more than aware of that. A well-armed society means that potential shooters never know what people have the means to defend themselves or others in the area. Makes them think twice before doing anything stupid. You can count on no one having guns in a gun free zone, which makes the shooter the person with all the power for that short period of time.