The philosophical foundations of Japanese wartime brutality emerged from a toxic synthesis of distorted Confucian hierarchy, perverted bushido ideology, and modern racial theories that positioned Japan as the apex of human civilization destined to rule over inferior Asian races. The concept of hakko ichiu, literally meaning "eight corners of the world under one roof," provided ideological justification for Japanese expansion by portraying conquest as a benevolent mission to bring backward peoples under the enlightened guidance of the emperor's divine authority.
The educational system that produced Japan's wartime generation systematically indoctrinated children with beliefs about Japanese racial superiority that made later atrocities psychologically acceptable to perpetrators who had been conditioned from childhood to view non-Japanese peoples as fundamentally different and inherently inferior. Textbooks portrayed Chinese, Koreans, and Southeast Asians as lazy, dishonest, and incapable of self-governance, while depicting Japanese people as uniquely virtuous, intelligent, and spiritually pure.