I am not a Sheep Dog.

via Vuurwapen Blog...

I wasn't carrying a gun to stop a school shooter and become some sort of hero. I was carrying a gun to preserve my own life. Just as I always carried a loaded Beretta 9 mm tucked inside my uniform when with Iraqi policemen inside their "station," I didn't trust that anyone else would be looking out for me first. It's not that I didn't think that the University of Arizona Police Department wouldn't do their very best to stop any potential shooting as soon as possible. I simply knew all too well how quickly such situations could play out, and how help nearby could be no help at all.
My carry philosophy has not changed much since that first day. My parents taught me to be responsible for myself. Scouting taught me to be prepared. Combat taught me to be aware.

Read the whole thing.  It should open up many eyes to the dangers of stumbling into situation where you don't have all the information.