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In fact, had an armed security guard been present at the shopping complex where the shooting occurred, there is a good chance the shooter might have been stopped before he got close to his targets.

1. Only if he walked for a long distance away with his gun visible or had already started firing and missed his targets.

2. And what is the chance that a security guard would happen to be in the exact same part of the mall?

3. It's probably mall-owners rather than gun laws that is stopping mall cops from being armed.