Never, but most people who defended themselves with firearms didn't either. It's one of those things that are unlikely to happen to you, but do happen to others.<quoted text>
How many times have you had to draw down?
We had a debate going on during the considerations of CCW's here in Ohio. One argued with me about the practicality of using firearms in our state. To make my point of having CCW's, I explained to him that my mother lives alone. She never drove a car either. She likes her walks to the store or church, and I was concerned about her safety at her age.
He wrote back asking me that if CCW's passed, would my elderly mother carry a firearm? To that I responded "No she wouldn't, but the criminal doesn't know that."
Criminals don't like uncertainty. If they are planning on stealing a car, they would choose one without an alarm than one that has an alarm. They have better odds at success that way. Same holds true of armed citizens. Most of these murders take place in areas where guns are not permitted by law-biding citizens. Again, uncertainty scares criminals.
Even if it was announced that a city decided to have armed teachers or administrators in a school building, that alone would discourage potential kooks like this guy in Connecticut from going there whether teachers or facility were armed or not. Again, uncertainty.