Who are we protected from with a gun free zone?

I have been studying the phenomenon of the "Gun Free Zone" and after much analysis have discovered the group of people from whom we are being protected.  The Venn Diagram at the left is my representation of some groups of people in the United States. The overwhelmingly larger group is the sensible, law abiding majority that wouldn't shoot you if you made a really bad cup of coffee, or cut you off in traffic.  Even if you stole the parking place one of these people were turning their car around to get, they would not gun you down.  These people know that dead is forever, and guns are for keeps.  They reserve the use of deadly force for truly life-threatening situations and they have proven, on balance, that they can recognize these when they occur.

The red circle represents that small portion of humanity that regards everyone but themselves as expendable.  When pushed far enough, they go nuts and throw all civility and humanity out the window.  They go get a gun and perpetrate murder.  Even if they have to drive all the way home to get their gun, they are so mad they won't be dissuaded from their goal. They will plan and wait weeks or months if need be. They also don't think "Gun Free Zones" apply to themselves, and might be carrying a weapon in the gun free zone.

The tangent point between these circles represents the crowd that we are being protected from by gun free zones.  Normally they are law abiding and thus don't carry weapons into a posted gun free zone. These folks, howerver,  have incredibly hot tempers and amazingly poor judgment.  They also have no ability to think of consequences past the immediate moment.  They are the ones who get so angry, so fast that if they had a gun at the critical moment they would shoot you dead.  "Take that, you incompetent fool!"  If they had to leave the area and drive home to get their gun first, they would cool down and probably be deflected by a sandwich.

Now that my hypothesis has identified the group that we are being protected against, we have to weigh the benefit of that protection against the benefit we might get from the much larger, normal group being allowed to carry weapons everywhere there isn't an enforced, disarmed zone such as a secured courthouse with metal detectors and guards and secure storage for the weapons.  I don't know how many folks fall into the newly identified category, but I bet it is about as big as represented in the diagram.  I do know that statistically, concealed carry permit holders are more law abiding than the general public and that most carry their weapons quietly for years with no incidents at all.

I also can point to many examples where armed citizens have saved their own lives and often the lives of others because they had a self defense weapon at hand when they needed one.  We even have an Examiner dedicated to chronicling  those examples daily in the person of Eric Puryear.  If you don't have the means at the moment you need it, self defense is ineffectual. 

I now make it a habit to ask businesses with posted Gun Free Zones who they are protecting us from.  They have yet to make a good case.  Most kick the reason for the sign "upstairs", saying it is for "insurance requirements" or "it is corporate policy".  Neither response addresses the logic,  justification, or the truth about the policy.  Let's keep asking that question until the purveyors of gun-free zones realize they have no answer.