Revolvers are simple, easy to use and, nearly idiot proof. As an LEO firearms instructor, I discovered it was much easier to train new hires on a revolver rather than a self loader. A semi-auto requires regular practice which, may or may not be available. I did carry a 1911 in the twilight years of my patrol work and shot it weekly. With that said, I always, always had a J frame second gun in my boot.

Texas Ranger Frank Hamer was quizzed about carrying a revolver and his reply was "Well if I needed more than five rounds, I wouldn't be very good at law enforcing".