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[–]worried19[S] 8 insightful - 1 fun8 insightful - 0 fun9 insightful - 1 fun -  (0 children)

Wait, am I misunderstanding or does it call left-handed people disturbed?

I think it's more that there's a disturbance in usual development that causes left-handedness. Incidentally, those exact same factors (men having more older brothers, being left-handed, and having that digit ratio) are also correlated with homosexuality. So I think there must be something going on that's biological. If there's a "disturbance" in prenatal development, you wind up with a more uncommon outcome, even if said "deviance" is completely benign.

In the cases where somebody develops one before puberty, it seems that there must be a genetic component.

Or a traumatic one. Children sadly can and do experience trauma before puberty. And even if they're not physically or sexually abused, they can also be exposed to unhealthy social conditioning, such as a little boy repeatedly being shamed for wanting to explore femininity.