Don't get me wrong I am not trashing automatics because I have those I carry as well, I'm just giving my train of thought. For example, lets say someone walks up with a knife or gun and demands your money, you reach into your back pocket (or purse) pretending to retrieve your wallet you and draw a semi auto pistol. If for any of the reasons above (because you will be under stress) the gun fails to fire how much time is a armed man going to give you to slap the magazine, rack the slide and attempt to fire again, how long will it take you under stress, it depends on your training but I can assure you longer than squeezing a trigger rapidly two or three times on a revolver. I have seen ammo fail to fire if it got wet or damp (over time) especially in the summer heat in a sweaty pocket or waistband, not very often but it does happen, this is another reason I cycle older ammo out of my carry guns. You have to check them often for lint and little objects which can get in the workings of a gun if carried in your pocket or purse.
I am not seeking to persuade anyone to carry a particular gun just give my reasons and thought process....However I will say I never feel under-protected with my 38 revolver.
Concealed Carry Philosophy, Part II
Concealed Carry Philosophy Part IV