Steve Ototo,
You are talking about prehistoric men, early homo sapiens, about 90000 years before the rise of agriculture and the first civilisations. What differentiate humans nowadays is their level of civilisation, their local culture, language, code of conduct, morals, laws, social conventions, etc. This has only really started to evolved since men live into organised states, with cities, specific jobs, social classes, laws, etc. My point is that the Japanese still behave like ancient Europeans because they have only settled in such organised agricultural societies for about 2000 years, as opposed to 7000 to 9000 years for Europeans (and all Westerners descendent from Europeans).
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