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Judging by the fact that ethnic and religious differences are #1 reason for conflict in history, I would say a homogenous nation is "healthier" and more efficient than a multi-racial one. Peaceful coexistence isn't impossible but it requires commitment and effort from all sides, not just the majority like the leftists and globalists want the public to believe. And people who come for gibs rarely show that commitment.
To Aristotle, multi ethnic societies are inherently anti democratic. They require autocracy to maintain social cohesion. Simon Bolivar came to this after having spent his whole life trying to create a unified, Republican Spanish America. He lamented the breakup of the Spanish Empire, saying "all who served the revolution have plowed the sea". So I think multi racial countries can be good with an autocratic government.