Sorry been working lately and now I have to figure out how to do something called multi-quote before responding to all the others.
This is what happens when an armed private citizen is present during what could have been a mass shooting. I speculate that, due to his age, the shooter may be a veteran.
http://www.youtube.com/v/epZod2qyyN4
My father carries concealed, being allowed by the concealed carry for retired law enforcement officer legislation signed by President GW Bush in 2004. He turned 87 on July 31 and scored over 90% on all shooting qualification courses of fire, beating many of the members of the Oklahoma Highway Patrol.
If you know of a shooting that was made worse by the presence of a concealed carry holder then that would be interesting. I have previously posted a number of shootings that were cut short by concealed permit holders.