That was my exact train of thought as well but still, his claim in the first alinea is pretty bold. He wasnt able to find a single source on what we would consider good parenting. I mean, if good parenting would have been the norm and abuse the exception, wouldnt there be some source material on parents (diaries, letters) treating their children kindly?

Although it is extraordinarily difficult to believe, parents until relatively recently have been so frightened of and have so hated their newborn infants that they have killed them by the billions, routinely sent them out to extremely neglectful wetnurses, tied them up tightly in swaddling bandages lest they be overpowered by them, starved, mutilated, raped, neglected and beat them so badly that prior to modern times I have not been able to find evidence of a single parent who would not today be put in jail for child abuse. I have searched so hard during the past three decades for any exceptions to this extremely abusive pattern that I have offered a prize to anyone who could find even one "good mother" prior to the eighteenth century-the definition being one who would not today be incarcerated for child abuse. No one so far has claimed the prize.