Oh baby!!!

Japan had been SO STRESSED.

Its a fucking island. The isolation and limited outside contact made each individual essential and social harmony a necessity. These social norms were very explicit and enforced strictly.

Back to the island. High population density and limited land is a stressed society. Internalized social shame based on dependency on the society itself being balanced and maintained manifested.

Rapid industrilization of Japan strengthened industrialized discipline, which is a reinforcement of rules.

Post War Japan. Atom bomb. Enough said.