When I was working as a full-time reporter in a small (pop. 25,000) city, I often thought about the possibility that someone who didn't like something we published might come into the newsroom and open fire (especially as we had one reporter who wasn't particularly circumspect in the way she described some people in her crime stories). Anyone could have just entered the building, ridden the elevator to the second floor and come in with guns a-blazing.
Our publisher at one point circulated office rules which included no guns on premises. Hell with that, I thought, and I kept my handgun with me in the office at all times thereafter.