"Any crossing of two beings not at exactly the same level produces a medium between the level of the two parents. This means: the offspring will probably stand higher than the racially lower parent, but not as high as the higher one. Consequently, it will later succumb in the struggle against the higher level. Such mating is contrary to the will of Nature for a higher breeding of all life. The precondition for this does not lie in associating superior and inferior, but in the total victory of the former. The stronger must dominate and not blend with the weaker, thus sacrificing his own greatness. Only the born weakling can view this as cruel, but he after all is only a weak and limited man; for if this law did not prevail, any conceivable higher development of organic living beings would be unthinkable. The consequence of this racial purity, universally valid in Nature, is not only the sharp outward delimitation of the various races, but their uniform character in themselves. The fox is always a fox, the goose a goose, the tiger a tiger, etc., and the difference can lie at most in the varying measure of force, strength, intelligence, dexterity, endurance,etc., of the individual specimens. But you will never find a fox who in his inner attitude might, for example, show humanitarian tendencies toward geese, as similarly there is no cat with a friendly inclination toward mice. Therefore, here, too, the struggle among themselves arises less from inner aversion than from hunger and love. In both cases, Nature looks on calmly, with satisfaction, in fact. In the struggle for daily bread all those who are weak and sickly or less determined succumb, while the struggle of the males for the female grants the right or opportunity to propagate only to the healthiest. And struggle is always a means for improving a species' health and power of resistance and, therefore, a cause of its higher development. If the process were different, all further and higher development would cease and the opposite would occur. For, since the inferior always predominates numerically over the best, if both had the same possibility of preserving life and propagating, the inferior would multiply so much more rapidly that in the end the best would inevitably be driven into the background, unless a correction of this state of affairs were undertaken. Nature does just this by subjecting the weaker part to such severe living conditions that by them alone the number is limited, and by not permitting the remainder to increase promiscuously, but making a new and ruthless choice according to strength and health. No more than Nature desires the mating of weaker with stronger individuals, even less does she desire the blending of a higher with a lower race, since, if she did, her whole work of higher breeding, over perhaps hundreds of thousands of years, might be ruined with one blow." - Adolf Hitler, Mein Kampf
This has to do with breeding and is as old as mankind. Plato's republic:
The method whereby this selective breeding will be conducted, Socrates explains, is that at designated calendar times and at the most appropriate periods of their sexual activity and fertility, the men and women of this class will be brought together in “marriage festivals,” but they will not be permitted the free choice of sexual partners. Rather, they will be “taught” that the older rulers have drawn all pairs of sexual partners by blind lot, whereas in fact the rulers will have paired the sexual partners by careful selection so as to ensure the success of the eugenic method the rulers have adopted.
As for the children so produced, they will have to be raised communally and provided for by citizens designated as nurses. Furthermore, the children are not to be permitted to recognize their birth parents; the children are not to be permitted to develop “old time” family loyalties; in fact, the birth mothers may be at times prohibited from nursing their children, who will be provided with wet-nurses for their needs.
This plan was implemented to a tee. SS officers were bred with select "ladies" and their children were raised in communes
Only the born weakling can view this as cruel, but he after all is only a weak and limited man; for if this law did not prevail, any conceivable higher development of organic living beings would be unthinkable. The consequence of this racial purity, universally valid in Nature, is not only the sharp outward delimitation of the various races, but their uniform character in themselves. The fox is always a fox, the goose a goose, the tiger a tiger, etc., and the difference can lie at most in the varying measure of force, strength, intelligence, dexterity, endurance,etc., of the individual specimens.
But you will never find a fox who in his inner attitude might, for example, show humanitarian tendencies toward geese, as similarly there is no cat with a friendly inclination toward mice. Therefore, here, too, the struggle among themselves arises less from inner aversion than from hunger and love. In both cases, Nature looks on calmly, with satisfaction, in fact. In the struggle for daily bread all those who are weak and sickly or less determined succumb, while the struggle of the males for the female grants the right or opportunity to propagate only to the healthiest.
And struggle is always a means for improving a species' health and power of resistance and, therefore, a cause of its higher development. If the process were different, all further and higher development would cease and the opposite would occur. For, since the inferior always predominates numerically over the best, if both had the same possibility of preserving life and propagating, the inferior would multiply so much more rapidly that in the end the best would inevitably be driven into the background, unless a correction of this state of affairs were undertaken.
Nature does just this by subjecting the weaker part to such severe living conditions that by them alone the number is limited, and by not permitting the remainder to increase promiscuously, but making a new and ruthless choice according to strength and health. No more than Nature desires the mating of weaker with stronger individuals, even less does she desire the blending of a higher with a lower race, since, if she did, her whole work of higher breeding, over perhaps hundreds of thousands of years, might be ruined with one blow."
- Adolf Hitler, Mein Kampf
Eugenics, and its bloody conclusions, are Darwin's spawn, not Christ's.