Suppose, that during the flight, you had a violent disagreement with your First Officer (and, make no mistake, during the flight, that F/O does belong to the Commander, like it or not, by the younger crowd) and his reply was...'I'd shoot the SOB.'
Hmmm, seems to me a pretty good reason to keep firearms firmly off the FD.
I'd say it speaks to the opposite.
A violent disagreement?
" The National Transportation Safety Board determines that the probable cause of the EgyptAir flight 990 accident is the airplane's departure from normal cruise flight and subsequent impact with the Atlantic Ocean as a result of the relief first officer's flight control inputs. The reason for the relief first officer's actions was not determined."
At least a taser
Edit: I agree a list of which airlines are or are not armed is totally crazy - if its out there, let the looker find it himself - discussing the merits or lack of merit is different