In your profile, you say you are a pilot, and you say you like the idea of having a gun.
Then tell me the scenario you prefere:
1: the gun is secured in a box locked with a code. A terrorist enters in the cockpit. The pilot: " Excuse me, Mr terrorist, but I have to type thecode to get my gun ...."
2: The gun is accessible very easily. Good point for the terrorist. He does not have to think how to go through the security. He knows he just has to jump in the cockpit. And, thanks to the surprise, he will take it before the pilot.
I can tell you that if the US pilots have guns, I will do my best to avoid them.
And for all the gun lovers, do you no that the Bobbies (London policeen) have no guns?
Ecoute les orgues, Elles jouent pour toi...C'est le requiem pour un con