It was a classic debate because some ideologies rested on the claim that genetics have no impact. Sorry but that is just not true and the latest data actually ties certain personality traits to specific gene locations. The following is an example of that-
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Extraversion, according to the "big 5" model,denotes people who are talkative, energetic, and assertive. And the San Diego scientists tracked it to variants in the gene WSCD2 and near gene PCDH15. Neuroticism, by contrast, is all about emotional shifts, moodiness, and anxiety, and it showed up in variants on chromosome 8p23.1 and gene L3MBTL2.”
Children are different when they are born. Optimum rearing practices should be based on these natural differences between children rather than assuming they are all the same and forcing a one size fits all approach.