Theories and origins

Despite the fact that social Darwinism bears Charles Darwin's name, it is also linked today with others, notably Herbert Spencer, Thomas Malthus, and Francis Galton, the founder of eugenics. In fact, Spencer was not described as a social Darwinist until the 1930s, long after his death.^[4]

Darwin himself gave serious consideration to Galton's work, but considered the ideas of "hereditary improvement" impractical. Aware of weaknesses in his own family, Darwin was sure that families would naturally refuse such selection and wreck the scheme. He thought that even if compulsory registration was the only way to improve the human race, this illiberal idea would be unacceptable, and it would be better to publicize the "principle of inheritance" and let people decide for themselves.^[5]

In The Descent of Man, and Selection in Relation to Sex of 1882 Darwin described how medical advances meant that the weaker were able to survive and have families, and commented on the effects of this, while cautioning that hard reason should not override sympathy, and considering how other factors might reduce the effect:

Thus the weak members of civilized societies propagate their kind. No one who has attended to the breeding of domestic animals will doubt that this must be highly injurious to the race of man. It is surprising how soon a want of care, or care wrongly directed, leads to the degeneration of a domestic race; but excepting in the case of man himself, hardly any one is so ignorant as to allow his worst animals to breed.
The aid which we feel impelled to give to the helpless is mainly an incidental result of the instinct of sympathy, which was originally acquired as part of the social instincts, but subsequently rendered, in the manner previously indicated, more tender and more widely diffused. Nor could we check our sympathy, even at the urging of hard reason, without deterioration in the noblest part of our nature. The surgeon may harden himself whilst performing an operation, for he knows that he is acting for the good of his patient; but if we were intentionally to neglect the weak and helpless, it could only be for a contingent benefit, with an overwhelming present evil. ... We must therefore bear the undoubtedly bad effects of the weak surviving and propagating their kind; but there appears to be at least one check in steady action, namely that the weaker and inferior members of society do not marry so freely as the sound; and this check might be indefinitely increased by the weak in body or mind refraining from marriage, though this is more to be hoped for than expected^[6].