I see your point, but look at the full title of Darwin’s book:
On the Origin of Species
by Means of Natural Selection,
or the Preservation of Favoured Races
in the Struggle for Life
I think you can see just from the title (i.e. ‘favoured races’) that human eugenics could be a tempting implementation of Darwinian ideas for some people. I’m not saying that Darwin actively encouaraged human engineering, but he discusses at length how animal breeding went about producing improvements in various species. It doesn’t take much of an imagination to move from animal breeding to human breeding. After all, doesn’t Darwinian theory demonstrate that we are all “animals”.
So, my point is that Darwinian theory lends itself to human eugenics - maybe not necessarily so, but it is not a stretch to see how it could be used that way. On the other hand, it is not possible for Jesus’ teachings, taken as a whole, to be used as a defense or motivation to commit the atrocities done in His name. The acts would be completely at odds with His character and moral teachings (as in the Sermon on the Mount).
Sure if the idiots ignored the words “by Means of Natural Selection” they could grab onto the words “Favored Races” as an excuse for their bad ideas. Of course if their Jewish they could take the idea of being the Chosen People and run right off the cliff with it too. Just because people take one phrase out of context and turn it into an excuse for their own stupidity doesn’t mean the core idea of the writing that contains that phrase is bad or that the writers was a bad person. Look at all the stupid stuff liberals have done with the Commerce Clause in the last 40 years, does that mean the Constitution is bad and the Founders should be held responsible?
Bad people take perfectly good ideas and screw them up, that’s how you know they’re bad people. They do it with Darwin, they do it with the Constitution, they do it with the Bible, they do it with Wealth of Nations, they do it with mediocre Beatles songs, they just do it.
It’s not possible to take Darwin’s teachings as a WHOLE to get an excuse to commit atrocities either. That’s why the people that commit atrocities using Darwinism, or Jesus, as an excuse edit.