You can have a civic nationalist multiracial socuety that functions just fine as long as it is not multicultural
The problem was not that they let soneone in of what some people might call a mongoloid race
The problem was that they let someone in of Chinese culture
There might additionally have been a problem of the Chinese government threatening to do things to her relatives in China if she does not subvert the United States when she visits
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There used to be a fictional debate about ethics between socrates and confucious by a Professor on youtube
It was fictional because Socrates and Confucious did not meet each other in real life as far as I know and he is guessing what such a debate would be like
When you let in people who practice Confucian culture their moral value system is not based on principles but on authority figures
This is why Europe used to have more advanced science when they met Asians