satt comments on Open thread, August 4 - 10, 2014 - Less Wrong Discussion
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So... does it mean that it's completely irrelevant who adopted Harry Potter, because the results would be the same anyway?
Or is the correct model something like: abuse can change things to worse, but any non-abusive parenting simply means the child will grow up determined by their genes? That is, we have a biologically set "destiny", and all the environment can do is either help us reach this destiny or somehow cripple us halfway (by abuse, by lack of nutrition, etc.).
In the context of IQ I've seen it claimed that normal variation in parenting doesn't do much, but extreme abuse can still have a substantial effect. So parenting quality would only make a difference at the tails of the parenting quality distribution, but there it would make quite a difference.