Comment Fanaticism = 1/Engineering (Score 1) 809
Engineering Ability = 1/Fanaticism
By 'Engineering Ability' I mean the overall knowledge, creativity, practice, experimenting, logistics, and generally effort involved in producing an rather complex technical devices.
As for the 9/11 group, it appears this was the top of the fanatics' intellectual/engineering crop, where fanaticism was sufficient just enough to match their engineering abilities, enabling them to fly, but not to takeoff/land the planes, or to save themselves. It is also beneficial (for the terrorized side), by above definition, such 'masterminds' are removed from living - at the time of their top achievement.
Subsequent attempts, while abundant in fanaticism, were mush less sophisticated in every aspect.
I like above equation because it keeps my hope in humanity a notch above the absolute zero.