I guess I'm one of those stupid, toothless, red-neck, son-of-a-guns that likes to see my rifle hang'in from the gun rack in the rear view mirror of my pickup truck... on my way to the diner to pick up my waitress girlfriend (the same one every other red-neck SOB is dating)!
Actually, I quite enjoy firearms... and I own a few. I strongly believe in our constitutional right to bear arms. All kidding aside, I even drive an F150!
That said, I think putting firearms in the cockpits makes it more of a target. Pilots have enough to contend with, and
El Al has the right idea. If bad guys can't access sensitive areas, you've taken the motivation away from them (and their ability to wage war against you). Plus, all the other reasons I mentioned above come to mind again.