Earlier quoted context omitted.
I think you were joking, but totalitarian regimes have done this before (Romania's orphan crisis was the result of similar policies, iirc). The poverty/immigration dance - if you reduce poverty, women have less children. Eventually you reach the point where you need to allow immigration to provide enough workers to keep your aging population from starving. Immigration is an existential threat if your country is based…
China internally makes a big deal about their 56 ethnic groups, living happily in harmony: https://en.wikipedia.org/wiki/Ethnic_minorities_in_China And woe betide anyone who dares be less than harmonious about being ruled by their Han big brother.
You should understand that translations often lose some cultural context, so when you have a prejudice against the English word "harmonious", understand that the Chinese equivalent is used much more freely in everyday speech. "Solidarity" might have been a better translation.
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Reply to the comment below:
> I recall that, in the 2008 Olympics opening ceremony, China celebrated its ethnic minorities by having Han children dress up as them [..]
In a big place like China or the US, there are always going to incidents like this. Furthermore, most news stories will exaggerate the headlines or twist the details, so I am not even sure if this particular incident is as you described. What matters is what the policies are doing for the larger scale of individuals. You can't judge anything about this larger scale by looking at a few incidents, especially when Western media have a vested interest in showing you these news items and ignoring the vast majority of what is going on. (To be fair, the vast majority is quite boring.)
"Ask the people themselves" is used typically in these discussions as a weasel phrase, as if Western liberal democracies are truly "asking the people themselves". You have mass media bombarding the general population all the time with pre-ordained narratives. Nobody votes in elections with an independent analysis. So sure, it depends on what you mean by "ask the people themselves". There's lots of content on social media including from ethnic minorities, people are generally happy with their lives and the amount of freedom they have. Are you going to pick holes in that? Why not pick holes in what's happening with mass media de-jure "independent" de-facto manipulative elections in the West?