It is understandable for a person to move to another nation to seek the opportunities which it provides, and which are unavailable in their native country. Similarly, it is understandable for them to wish to keep their culture, mindset, beliefs and social temperament unchanged. There is talk that Americanization rapes immigrants of their heritage.
It is however the opposite. For if the people of one nation do not have the opportunities of another, it is for some reason; it may be physical or biological(which it obviously isn’t); it may arise for the form of government and the particular laws it imposes; and it may be the result of their culture, and social temperament. Whatever the cause, it is not random that some nations prosper more than merely their physical conditions indicate they would. There is a certain level of efficiency/effectiveness in their ideas.
For a people to move into such a more prosperous nation, take advantage of its promise, and yet maintain the culture and outlook which failed to provide them change, rapes the more prosperous State of its gains. Furthermore, if those people reproduce at an inordinate rate they can effectively take over, or alter the landscape of the country they move into and to such an extent that it is ruled not by the ideas of the founders and their decedents, but by the unsuccessful ideas of outsiders who refuse to adopt the the successful strategy of their new ‘home’.
Not all immigrants refuse to adopt their new country’s society as their own, however by moving to another country and discounting its culture, society and governers many bite the hand which feeds them.