How long will it take for folks to realize that 'gun free' zones are just magnets for carnage. When an active shooting situation occurs, the police response time allows the shooter ample opportunity to kill/injure as many people as possible. And, as in many cases, once an officer engaged the Ft Hood shooter, the shooter took his own life without a shot fired by the officer.
Imagine, had one person been able to engage the shooter before the military police arrived, how many of the deaths/injuries could have been prevented.
http://www.cnn.com/2014/04/02/us/fort-hood-shooting/