Most visionary geniuses that change the world are part asshole. A genius that is not an asshole, at least to some extent will not get things done that can only be done by being an asshole. A genius that is too much of an asshole will alienate too many people and will not get done what needs to be done. It is a delicate balance that Jobs was able to get right at several key points in his career. At others...not so much.