What malarkey!!!  I doubt "positive" thrill seekers move the world forward and I also doubt that terrorists are mainly motivated by thrill-seeking - more likely by ideology.  And I certainly never got a sense how "crane-bimbo" would help the wold move in a positive direction - wanting to climb does not make you bright and inquisitive.  Just goes to show that a "Professor" in front of your name does not prevent you from spewing BS.