NBC News: Why the San Bernardino Shooting Scares Us So Much

What happened in San Bernardino strikes home with Americans precisely because it happened at work.  And while the U.S. has been plagued by deadly workplace shootings, the idea of a home-grown jihadi gunning down his co-workers in the name of Allah is especially terrifying, according to experts.  TAG's expert Dr. Joel Dvoskin gives his input.  

Simon Levshin