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You could reasonably wonder why Hispanic people come to the US and don't want to learn English. They don't even have their families grow up with English.
You could reasonably wonder why people would want to be shut out from almost all of the culture, almost all of the opportunities, almost all of the income that is available in this country. Why they would want to be isolated and bounded and handicapped like that.
Maybe in the societies that they come from, there is no culture. Maybe they're not missing anything. Maybe in the societies that they come from, landlords and police and government are thoroughly evil. Maybe it's normal for them to keep their heads down.