Um, the eugenics part came separate from the genetics.
There are posters here who know the history of eugenics and Darwinism and how they are tied together much better than I.
There have been several threads on it, as a matter of fact.
I’m not sure what keywords to use to find them, but perhaps someone else more familiar with the topic does, or the FReeper who posted the threads.
The racism and eugenics movement that was starting when Darwin published his theory was heavily dependent on the ToE as justification for it.
Just so everyone is clear, the eugenics movement was started by the DARWIN FAMILY and they were the leaders of the eugenics movement well into the 20th century.
Prior to the Scopes trial eugenics was the "popular" facet of Darwinism and it remains every bit as integral to Darwinism as the Theory of Evolution.
Mendel's work on genes and inheritance wasn't widely known until decades after he died, so how the "eugenics movement" would be around in Darwin's time to associate him with their "cause" is a mystery to me. Darwin himself clearly had no knowledge of genetics at all. Racism was around in the 1860s, certainly, but the idea that people were racially inferior because of their genes and the traits they inherited was unheard of until the early 20th century.
Again, the claim you're making would be similar to arguing that the Wright Bros. invention of the airplane caused more carnage in the civil war than would have happened otherwise.
If any freepers would like to prove me wrong and show me all the evil eugenic policies and references to inheritance in Darwin's works, they are free to post otherwise.