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Much of what became common when evolutionism was accepted can be found inCh.2, Descent of Man
For example,
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Malthus has discussed these several checks, but he does not lay stress enough on what is probably the most important of all, namely infanticide, especially of female infants and the habit of procuring abortion. These practices now prevail in many quarters of the world; and infanticide seems formerly to have prevailed, as Mr. M'Lennan* has shewn on a still more extensive scale. These practices appear to have originated in savages recognising the difficulty, or rather the impossibility of supporting all the infants that are born.
In this single chapter, Darwin explains the benefits of infanticide/abortion eugenics/racism, and at least some forms of Social Darwinism. Not the most pleasant reading - I didn't yet do a thorough job myself.

Ironically, we now live in a much more primitive culture than he did. Ironically, but not surprisingly.

It has occurred to me, we are devolving, not evolving. I guess it's the tendency of people who teach the theory of evolution to exclaim about how much more intelligent we are than our ancesotors but I have failed time and again to find proof of it. Our technology may be more than they had 2000 years ago but we wouldn't have any of it if it weren't for the brilliance of our ancestors, as one thing leads to another. It's egads whole lots easier to be born into this society they laid the path for and survive without too much trouble than it was to survive with very little for many of our ancestors, who had to be sharp and fit and ready most of the time, invent new ways of doing basic things more easily, figure out things that no one laid on your plate yet... we have become very degenerate in regard to our ancestors. we are a degenerate people at this point, in process of destroying our culture and ourselves within it.

Concerning abortion directly, it kind of makes you wonder how many brilliant minds we have thrown into the trash can, before they could even speak. And we convince ourselves somehow it's right. Without the theory of evolution, social darwinism, being drilled into the heads of generations of kids it never would have been possible that is a fact.

Several years ago I read an article in National Geographic that compared the behaviors of what is believed to be one of the most violent primitive people still left on earth (somewhere down in SA, cannibals even if i remember correctly) to our own culture. And essentially, in comparison, our culture is actually more violent was the conclusion.