A Shooting in Tucson

Yesterday our neighbor had to be transported to St. Mary's hospital. His wife could not go in the hospital because it was in lock-down. It was locked down because a deranged individual shot Congresswoman Giffords in the head and killed 6 other people. They were on high alert until details of the shooting were available.
Congresswoman Giffords was having a meet and greet in a Safeway in the affluent end of Tucson. The gun man walked up to her with a semi-automatic and started firing.
One of the justifications for Arizona's very liberal policy on who can own and carry guns is that if everyone is armed, things like this won't happen, because all of the good people carrying guns will stop it. In this case, two brave unarmed citizens tackled the gun man and sat on him. I've fired a handgun, it's really hard to hit anything, I'm grateful that he was subdued with a tackle and not another gun.
It's just hard to fathom how this can happen. We are profoundly sad for everyone touched by this incident.