You are absolutely wrong. Social Darwinism was not the misuse of Darwinian theory, it was putting Darwinian theory into action:
With savages, the weak in body or mind are soon eliminated; and those that survive commonly exhibit a vigorous state of health. We civilised men, on the other hand, do our utmost to check the process of elimination; we build asylums for the imbecile, the maimed, and the sick; we institute poor-laws; and our medical men exert their utmost skill to save the life of every one to the last moment. There is reason to believe that vaccination has preserved thousands, who from a weak constitution would formerly have succumbed to small-pox. Thus the weak members of civilised 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.
Darwin, "The Descent of Man", Chapter V.
That's your boy speaking, not social darwinists, not creationists, but your man himself, the immoral, the racist, the mysogenist Charles Darwin. And all the quotes given to you are not just a peripheral part of his theory but an essential part of his theory.
As I said, if you're going to go ad hominem, let's start with the misogynist Paul, then we'll move to that drunkard Noah, and then the immorality of half the other characters said by God to be good. Moses even lied to Pharoah's face! "Let my people go" yeah, to the desert for a few days to worship is what he said to Pharoah and to which Pharoah finally agreed, not to go free, yet they took off. So much for honesty.
How is that different from building and using a bomb? Does the bomb disprove chemistry and physics? Does the fact that physicist might want to kill people make killing the only proper use of physics?