So I heard an interesting theory from a guy the other day. Basically he said that the reason we see so much immigration and promotion of interracial mixing (which I don't mind, race is a silly concept) from the government and government-run media is because Europe is trying to improve the genetic make-up of its citizens. He said France has been doing it since the 70s, and other countries, like Germany and Netherlands are starting to do it too.
The idea is that anyone who is genetically 'too pure' (i.e. born from parents of the same race, from the same region, who themselves were born to parents of the same race, etc.) will suffer from congenital diseases, as well as not live as long, not be as strong as their counterparts from mixed marriages.
What 'they' are trying to achieve then is to introduce African genes into the gene pool, along with assimilation into the culture. So a black man has a baby with a white woman, they have a mulatto, then that mulatto has children with a white, and so on, the offspring eventually become white again, but are a product of that country's culture, customs, language, etc. so what you get is a white person, from a European country, but with stronger genes because they were introduced by a black ancestor way back when.
Prima facie, this theory makes sense. And you can see why countries would want to do it, in two, three, four, five etc. generations they would have a country with people who have better genes than they used to, are healthier, stronger, can achieve more, but for all intents and purposes are still the same race/nation/people of that country. Genetics improve, while homogeneity remains.
pic unrelated