It is not because one crosses a border that miraculously one finds oneself endowed with a citizen behavior above the average of the indigenous people

 

Immigration, once presented as a chance for [the West], renovation of an old culture, fruitful interbreeding, and cross-pollination (botanical metaphor used by people who have never done biology) is over.

 writes Yves Bourdillon at Contrepoints

While immigrants can, of course, contribute a lot to their host country, there is no particular reason why collectively their contribution would be positive in terms of social cohesion or prosperity; it is not because one crosses a border that miraculously one finds oneself endowed with economic productivity, an entrepreneurial sense, or a citizen behavior above the average of the indigenous people. It may even be that the reverse is true because of the difficulties or at least the time taken to acquire the cultural and linguistic codes.