The big proportion of immigrants compared to the whole society is effecting serious social and economical stress in the Western European countries. Social, because the politicans in power, promote settling of people with another culture and mentality, and not that what the indigenous have. Economical, because the immigrants' considerable part is not from emotional, but from a material consideration undertakes work in the recipient country. In Germany, for example, the Turkish nationality immigrant, who take a job there, under appropriate conditions, he will be entitled to a pension in Germany, however he will spend it in his own country, because the pension will be paid to him in other countries. (At home he will live as a little king from this money of course.)
It is necessary to handle the immigration question philosophically. It is undeniable fact, that between the immigrants the crime rate is high. France and Germany are the most typical examples.