Had we know of the mentality, how far the terrorist was willing to go 9/11, of course the outcome probably would have been very different, as in theory overcoming 2 crazy guys with knives would not have been a surprise.
It was the element of shock and awe, that we could not believe that the ultimate goal would be total self-destruction, to achieve our goals.
One of my points is that it is very clear, the airports own thirst to make money far super-seeds and security needs!
Some airports does show some logic with crews, and this is much appreciated. However the majority operate with a strange logic - which makes any intelligent human being raise questions of their methods and thought process!