Comparing apples with oranges there I feel, Pullock. Bouncers aren't in the same league as Air Marshalls. The flyers are highly trained professionals, and therin lies the difference.
A "bouncer" probably would have intervened. The trained professionals wouldn't. On this occasion the bouncer might have saved the day, but what if there were other hijackers on board? If this were the case, our bouncer now has trouble, and probably would have screwed up.
Your 20/20 hindsight is marvellous, but when all hell is breaking loose, the air marshalls must rely on their discipline and training. Thats why they are doing this job and not standing out the front of a pub.