Your failure to see the ideology to be the cause and to falsely blame the people who founded that ideology shows you arent thinking it through.
The fist Pope didnt start the inquisition, but Catholicism sure did.
Darwin never spoke to Hitler, but evolutionary thinking sure did. Marx, too, and that means Stalin, too, and Mao, and Pol Pot and since Evolutio is what feeds liberalism and Non-Biblical belief, it feeds the liberals and democrats, too.
As compared to Darwin didn't start the Holocaust, but evolution did?
Your premise is the Nazi philosophy was predicated on the theory of eugenics, started by Sir Francis Galton, a cousin of Darwin,(didn't know that did you ?) that an superior race built on selective breeding will improve the human race.
In principle, you can make that connection, but neglect the fact the Jews would have been systematically persecuted regardless of what Darwin wrote or whether or not Hitler believed in evolution / eugenics theories.