In "No Two Alike" Harris argues that the biggest non-shared environment personality determinant is peer group. So Harry Potter style "Lock him up in a closet with no friends" would actually have a huge effect.
And it should be noted that parents do have control over peer group: where to live, public school vs. private school vs. homeschooling, getting children to join things, etc. So parenting still matters even if it's all down to genetics and non-shared environment.
Also, has anyone investigated whether the proper response to publicized social-science answers/theories/whatever you want to call them is to assume they're true or just wait for them to be rejected? That is: how many publicized social-science answers [the same question could be asked for diet-advice...
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