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.
Also, the data show most active killers have no intention of surviving the event.
They may select schools and shopping malls because of the large number of defenseless victims and the virtual guarantee no on the scene one is armed.
As soon as they're confronted by any [my emphasis] armed resistance, the shooters typically turn the gun on themselves.
A couple of the commenters chided the reporter for referring to his sources in generalities. In the comments he responds by naming his experts and providing links to his data sources.
(via Instapundit and Arms & the Law)