Genghis Khan: A Mastermind or a Member of the Loony Bin?

Genghis Khan does have some tendencies to do what people would normally not do.  An example of this would be when Genghis shot an arrow at his half-brother an killing him solely based upon his half-brother stealing on of his fishes.  Despite these abnormal behaviors, I believe that Genghis Khan was a great leader.  One argument made against Genghis Khan's sanity was the fact that he murdered a gigantic number of people.  Other Mongolian leaders are not looked at as being insane, yet they did the same thing on a smaller scale; their lifestyle was based upon raiding others to gain supplies and women.  Other great leaders are not innocent either; they had to have murdered a lot of people as well.  Genghis Khan was not a killing machine either.  He was a compassionate man who tried to rationalize the attacks and slaying of his victims.