Psychodad -
If the cockpit crew had been armed, do you think the outcome could have been worse?? Once the door closes, you're on your own. We must now assume that any hijacking is a suicidal mass-murderer.
If one doesn't have the guts to protect yourself, your crew, and your pax in a last ditch defense situation, maybe one should find a nice job in a library basement. I and thousands of others don't want to be slaughtered like chickens for some gun-phobic liberal's discredited theories.