This attitude displays a fundamental lack of understanding of human society. People from different cultures are different. Not because of race, but because of cultural socialization, which persists for generations even in a new host country. In a democracy, those cultural differences will be reflected in the government and society of the new country. There are perfectly good reasons why the people in new country wouldn’t want to live with those changes.

For example, my parents come from Bangladesh, which was disarmed by the British. They cannot understand—for deeply cultural reasons—why anyone would need a gun. My wife’s parents, meanwhile, come from a frontier tradition, where you need guns to protect yourself from mountain lions or in places far from the reach of the law. Insofar as everyone votes their culture, why shouldn’t the people who are already here be able to say “we don’t have anything against your culture, but we prefer ours, and we don’t want you coming her and changing our society?”