I too have the same add on to FS2000, and as a current 767 skipper I can assure you that it is so realistic that I could probably get you to fly the autopilot into a building within ten minutes instruction!
However latest reports are now suggesting that some of the terrorists took flight training in Florida over the recent past. So one suspects a mix of basic and computer training.
As for banning the game? I don't think that would be feasable now that so many sims are available, and anyway if you don't use one tool another is always found.