Actually, they are, but you'd rather not admit it...
Come back with statistics about how law abiding people that chose to carry guns would react and the numbers will be rather different.
Again, they won't. As you've pointed out, once the first gun's out, the fight is OVER...and the bad guys will be the ones drawing first.
Having the 'good guys' freeze up at first is not a problem.
How do you know? Have you ever outdrawn a man who's already pulled out a gun?
That just means either the some other passenger solved the issue before they became un froze and complicated it or else they become on frozen after the terrorist have fully announced themselves and picking targets will be easy.
I'd love to see all these macho-he-men show me, with a live-fire exercise, how they'd outdraw a guy who's already got his gun out and ready.
What is better? a hand full of dead terrorists and a couple wounded bystanders or September 11?
A far more likely result: a handful of dead terrorists, a bunch of dead passengers, including friendlies, macho-he-men puffing up to sing their victory song...
And the second wave of terrorists caps the macho-he-men, gain control of the aircraft, and we still have 9/11.
Unarmed melees favor the many over the few. Gunfights favor the organized over the unorganized. I'd prefer the former instead of the latter. Leave the guns in the cockpit as final protective fires.
Who draws first only matters if they are pointing their guns AT YOU. In a crowd they will be waving their weapons around and will never see you draw unless you are a moron. So yeah, the good guy will get the drop on them, even if he draws second.