It seems that most of the criticism about citizens carrying firearms stems from an assumption that such individuals are using guns in an adversarial way, pursuing the enemy in a combat situation.
I recall that as a new recruit for the Salt Lake City Police Department, I was given a pistol and advised by the training officer that this was provided for my protection. I was told that as an officer I could be assigned to situations where I would possibly be required to defend myself against an adversary much stronger and bigger than myself. As a last resort, the firearm was meant as a means of survival.
I would hope all carry-permit holders would feel that this is the reason they have a firearm for their own protection and to protect others who may be at risk.