Is eugenics and euthanasia a modern concern and is it more conservative or liberal rich elite that promote it?

Back in old days, pagan/naturalist elites promoted it. Scientific engineering, satanic basically. Dehumanized people with mental challenges, people different races.

I have spiritual and political theories, but I don't wanna be labeled a conspiracy theorist. They wanted to engineer them

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Bonus point: in the modern world, who would it effect? Who would propose it and how? It would be manipulated as something positive in the media?
Is eugenics and euthanasia a modern concern and is it more conservative or liberal rich elite that promote it?
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