No, eugenics fit right in with what most people believed then --- (and many still do) -- i.e. that you could categorize peoples intelligence, talents, faults or proclivities based upon their race or ethnicity.
Irish are drunks, Italians are lovers, Poles are stupid, Jews are greedy, Blacks are stupid, shiftless and whatever other negative trait you wanted to throw at them.
Eugenics was nothing but blatant racial stereotyping by college graduates instead of racist stumble bums down at the mill.
Yes, they used Darwin and five syllable words, but only to reinforce their own prejudices and to reach the Utopian ends they dreamed of. That's not Darwin's fault.
BTW. Before Darwin, the same people used the Bible to do the same thing.