It was obvious his conviction that his country could not lose was based on faulty reasoning. Japan was inevitably going to lose, nuclear bomb or not. So I think his persistence was fueled by his blind allegiance to his country, most likely because he believed that his country was superior to all other countries because he was born in it. Professional or not, I think the primary motivation was his country, and not his training. Doing something that dedicated requires a firm belief in the purpose (unless you were retarded to some degree). Of course he may have been lied to, or misled into thinking his country was greater than it was. In any case this would be why blind allegiance is bad.