I don’t mind more Bangladeshes. Seems like your whole issue is that they’re a different ethnicity. Kids born in the US are citizens and you have no good reason to think they’re worse somehow.
You think you don't because you don't know anything about the culture and any contact you have with the community is superficial and arm's length. I'm Bangladeshi--my family has no knowledge of even a single ancestor from anywhere else. Bangladeshis aren't just Iowans with darker skin. Our mothers socialize us very differently from birth.
That’s a great example, but with one key difference. Mormons went out and built their own society in the middle of nowhere on land nobody else wanted. But how would you like it if tens of thousands of mormons moved into your town and reshaped it according to their culture?