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I wonder what definition they used for "terrorist"? The way governments use it, the definition is: Any outsider who uses violence to obtain their ends. An outside person or group who bombs a building, even if it is a military building like the pentagon, is a terrorist. A government which nukes or firebombs an entire city of civilians is not. (They simply declare the city a military target.)

With this sort of definition, of course engineers will predominate as terrorists. What other sort of private person could figure out how to make a bomb, an art history major? The desire may be just as prevalent, but the ability is lacking.