Actually its a fairly insignificant number involving someone with a firearm who was neither a cop or security guard (according to your own link it is 1 out of 160, 0.6%). In fact conceal and carry permits have had little to no positive effect on crime rates.
Defensive gun use also must be discounted as a general factor
“36 to 64 percent of the defensive gun uses reported in the survey were likely illegal—meaning the firearm was used to intimidate or harm another person rather than for legitimate self-defense.”
