I'd say overconfidence is a natural state for the mananimal while order and reason work as inhibitors for it. Things go crazy when twisted reason completely justifies the overconfidence.
There's plenty of situations that naturally give a confidence + X stat without you having to sacrifice cpu time of the insufficiently powered reason. Like having a buddy around. Probably has a lot to do with hunting for food, among other things.
Oh and evidently Bob and his loyal supporters stormed some big nintendo store in NY handing out copies of Bob's game and putting up posters.