Genghis Khan - insane or genius?

Genghis Khan was known for being one of the most ruthless leaders the world has ever seen. But was he crazy? I think that depends on your definition. I think he was extremely power hungry and driven - all of his attacks were thoughtfully planned out ahead of time. There was always a reason, a purpose, a strategy. He wasn't just randomly killing of people - you know, except for his half brother that took his fish. He carefully planned out all of his attacks so that they would benefit him - often scaring other potential targets into surrendering. He could just as easily have slaughtered them, but it was more logical to let them give up peacefully. He was also said to save women and children from the attacks. I know, "but killing men is just as bad!" The world he was brought up in was brutal, though. Survival was vital and could only be achieved through personal strength and determination. Genghis Khan was raised and taught that in order to survive and thrive, seizing power was necessary. And killing was necessary to seize power. Do I think killing a family member over a fish is normal? No. In fact, I personally believe that there's something abnormal going on in a person's brain who can willingly and relentlessly murder people. But that's just my opinion - Genghis Khan could have very well been completely healthy. He certainly was intellectually.