The way Japanese soldiers were trained: sexually and emotionally repressed under suffocating blankets of totalitarianism.
What Japanese soldiers were taught from birth: Chinese are inferior, subhuman, and easy to defeat. Chinese are unworthy of life.
What Japanese soldiers experienced at Shanghai: extreme humiliation and defeat at the hands of the Chinese.
Not only was Nanking revenge for Shanghai, it was a chance to reclaim their dignity, reaffirm their beliefs, and unleash, finally, their repressed anger and sexual frustration.
The Rape of Nanking, Iris Chang