A store owner and his son were shot to death during a robbery at 2pm on a saturday afternoon NEXT DOOR to my office (as in just a few feet away). The son was shot first and the father ran into the bathroom and locked the door. The killer kicked the door in and shot the dad to death in the bathroom.
A few months before that a college kid got his teeth knocked out in the parking lot of my office building when he was walking home from the bars.
I'm 6'3" and always thought most bad guys would pass me by and look for an easier target. However, after the two incidents noted above I realized that criminals are getting pretty brave these days so I decided I might as well start exercising my 2A rights.