I'm sorry Lazs, but you are only partially right:
-Concealed carriers are law abiding: ok
-Basic shooting and safe handling can be taught in a couple of weeks: ok
-the possibility to face a person carrying a concealed gun has a deterrent effect upon criminals: ok
However, what can't be taught other than by intense training is the ability to perform good judgement and accurate actions under heavy stress. A person allowed to carry a gun, even if safe under normal circumstances, can make much collateral damage by trying to solve a stressful situation.
The problem of a school shooting is an 'easy' one: on one hand, you have a complete mad murdering innocents. You're armed. You HAVE to do something to make it stop.
OTOH, you're in a bank and a couple of robbers come in and calmly hold everybody at gunpoint. They seem to act 'professionally'. Everybody is facing a lethal danger, but nobody has been hurt yet. If you draw your gun and try to take down both robbers, you put at risk the life of many innocents. However, the thieves may very well take an hostage to cover their retreat, or just shoot down everybody when they leave...no witnesses. What do you do?
Which brings me to the question: why would some people want to carry a gun when it restricts their freedom (as you said no bars, no alcohol, no sporting events...) and is a serious responsibility?
- Because they are competent and feel that they be a part of public security? ok for me.
- Because they feel threatened? With objective reasons (ok) or are they just a bit paranoid? Hmmmm...
- Because they suffer from an inferiority complex? Ouch....
- Because they want to be like John McCain? Awwww...
If you've been witness of road accidents, try to remember how many citizens present on the scene acted competently and efficiently, how many just stayed in the way a bit shocked doing nothing, and how many turned to be a real hazard (putting themselves close to traffic, smoking near a turned over car, or trying to move or 'fix' a seriously wounded person without any knowledge nor objective reason). Would you like those people to carry a gun next to you?
You said yourself that recoil disengages the brain the first times that somebody shoots a gun. What do you think that bullets flying around will do to his reasoning the first time a concealed carrier is shot at?