As much as I support carry - Lott must be taken with a grain of salt about gun free zones. We've been down this road before.
Rampages depend on the shooter characteristic and we have plenty in zones with guns.
It is not the strongest argument.
The better argument is that in a gun free zone, you do not have the ability to defend yourself efficaciously.
You can be a human shield or charge waving your IPAD.
It's OREGON by the way! And the Tacoma mall carrier can trump the Oregon story if true. BE CAREFUL with cliched arguments!