People act based on their recognition.
If the Rounds believe the illusion, that is, the reason why they have conquered Triangles was to civilize the barbarians, they will perceive that the culture of Triangles is also barbaric. In this case, they would force their culture on Triangles in due course. This includes the language, the religion, the family system, the way to protect children, the taboo of sex, the medical ethics, the political system, the standard of crimes and the food culture.
Destroy the barbarians' temple!

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