Apollo just doesn't get the message here...criminals love unarmed victims! He is advocating showing up (by default) for a knife/gun fight with his wife's best friend in his hand for armament. When that hijacker enters the "sterile" cockpit...he is the only SOB with a weapon (using Apollo's line of thought). Now just who do you think is going to win that fight?
You fret about a decompression or some other hole appearing in the aircraft...consider what the WTC did as it came throught the windscreen , Apollo.
The Captain has the final responsiblity for the safe operation of the aircraft....if it means having an old fashioned Dodge City shootout at FL 30 something...then belly up to the bar sport! This is the real world of modern commerical aviation. Airmail pilots were issued sidearms during the early years of aviation...maybe it is time to resume that practice.
As for me...knowing a couple or three well trained , armed Sky Marshals were standing between me and the bad guys ,would bring peace of mind. At least they could whittle down the odds a bit before I had to use my glib sense of humor on a hijacker bound upon flying me and everyone with me into a building at near Mach speed!
Get real Apollo...evil people got guns and knives...better to die standing up than lying down!