From Vox Day:
For little more than the fear of being called racist and in a futile attempt assuage the guilt for past centuries of colonialism, the people of the West have permitted their countries to be invaded by barbarians. Instead of civilizing the immigrants, as it was foolishly imagined, the immigrants have increasingly barbarized the nations they have invaded en masse. This should not have been a surprise, as the attempts to civilize them in their native lands had failed for hundreds of years.
The problem isn't that Africans or Central Americans cannot ever be civilized or that there is a civilization gene, the problem is that like domesticating an animal species, civilizing an entire culture is a process that takes hundreds of years. Consider, for example, how long it took the barbarians of Britain and Germany to go from the naked pagan barbarism described by Julius Caesar to the heights of Christian civilization that produced Mozart and the chamber orchestras. The nations of the West doesn't have that much time, especially when they can no longer serve as a strong and stable models, having invited the enervating peoples into their civilizations. Moreover, in addition to attempting to civilize the barbarians inside their borders rather than outside them, they are trying to do so without the benefit of Christianity, which historically played a powerful role in the civilization of the white European barbarians.
I’ve spent about a week and a half trying to think of something to add to this, but this is pretty much a perfect summation of the situation at hand. Culture takes centuries, if not occasionally millennia, to come into being. Even then, there is an element of fortune to this, as Thomas Sowell noted in Conquests and Culture and again in Migrations and Culture. Geography, external influences, and a host of other, seemingly random variables all play a role the development, rise, and decline of culture. Many of these variables are beyond the recipients’ control.
Given the inherent difficulties in developing a culture, plus the sheer amount of time such development takes, it should, as Vox notes, come as no surprise that the barbarians inside the gates are not civilized and likely will not become civilized in the near future. It’s not a matter of race or genetics; it’s simply a matter of time and circumstance.