It's more complicated than that...
Heritability measures in infancy are as low as 0.2, around 0.4 in middle childhood, and as high as 0.8 in adulthood. One proposed explanation is that people with different genes tend to reinforce the effects of those genes, for example by seeking out different environments. Debate is ongoing about whether these heritability estimates are too high, owing to inadequate consideration of various factors — such as the environment being relatively more important in families with low socioeconomic status, or the effect of the maternal (fetal) environment.
...as you see the genetic component is very low in children. But since there is correlation with good environments it then self-reinforces as individuals age.
This is why it is of critical importance to insure all children have access to a learning environment conducive to mental development.
Isn't that a bit like observing that 1-yo males and females have similar breast sizes, 10-yo males and females have slightly different average breast sizes, and 20-yo males and females have very different average breast sizes, then concluding that the differences in breast sizes between males and females are mostly due to environment, since as they get older they are exposed to more and more of the environment?
Whether or not eugenics "works" is completely not open for debate, unless people want to argue that evolution is some conspiracy theory.
Those insisting that eugenics doesn't "work" look about as goofy as someone insisting that slavery doesn't "work." First, it is indisputable that it "works": you need something done, you threaten to kill people unless they do it; so it gets done. Second, no one cares about the fact that it works, people only care about the fact that it's immoral.
The only "eugenics" I support is cutting back welfare, or reforming it. I might be in favor of extra welfare money given to those who choose to get birth control, but that one's a slippery slope.
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