The follow up question should be, "How many people who are licensed to carry, are practiced enough to carry responsibly?" I fear that with the increasing number of CCW applications being approved, far too many individuals who are able to carry are lulled into a false sense of security by a state issued card and a shiny news handgun from the LGS. I'm an ardent supporter of the 2nd, and encourage people to become involved in the shooting sports (as well as self defense/CCW), but I'm also a pragmatist. Most folks don't have the geographic/economic means to practice sufficiently with their new handguns to be considered competent and responsible CCW holders. With all due respect, a mandatory pre-CCW safety class does not a skilled handgun owner make. I worry that the current generation's CCW is the previous generation's desk drawer gun, and that far too many folks who are carrying are lacking the skills to actually be carrying.
This is strictly opinion-based thinking, MY OPINION ... completely unscientific and lacking in statistical research. It's simply a sense I get.