Found this HERE
The other statistic that emerged from a study of active killers is that they almost exclusively seek out "gun free" zones for their attacks.
In most states, concealed handguns are prohibited at schools and on college campuses even for those with permits.
Many malls and workplaces also place signs at their entrances prohibiting firearms on the premises.
Now tacticians believe the signs themselves may be an invitation to the active killers.
The psychological profile of a mass murderer indicates he is looking to inflict the most casualties as quickly as possible.
If you had listed to those of us that own guns you would have know this years ago. Now if you would just wake up to the fact that an armed citizen is a safe citizen, not a criminal we would really make some progress here . . .