In Mises Daily today, Toby Baxendale explains that when it comes to survival of the fittest, the fittest are those who can work peacefully with others.
Social Darwinism has nothing, seemingly, to do with Darwin himself. He never advocated a social policy of promotion of the natural tendency to the survival of the fittest. He thought that appropriation by others was the key in advancing man in society.
The Descent of Man is his book that touches most on these issues. Darwin himself imagines that primeval man was “influenced by the praise and blame of his fellows,” and that for individuals, there were many social rewards in avoiding purely selfish behavior since the “tribe would approve of conduct which appeared to them to be for the general good, and would reprobate that which appeared evil.” Primeval individuals knew that the acceptance of the group was important to survival, so, Darwin concludes, “[i]t is, therefore, hardly possible to exaggerate the importance during rude times of the love of praise and the dread of blame.”