That "generally considered" idea does exist, and it's bullshit. It's verifiable through annual stats from the US Dept of Health and Human Services, that no group commits more child abuse than mothers acting alone. It's twice as frequent as the amount done by fathers alone.
That statistic doesn't disprove anything about the claim that women would be biased in child abuse cases. As you said, those abusive women are a minority among the greater population of mothers/women, so it is still easily possible the majority has a bias toward overly protective. This isn't to say they do have such a bias, only that those stats don't verify things ones way or another for that claim.
That statistic doesn't disprove anything about the claim that women would be biased in child abuse cases. As you said, those abusive women are a minority among the greater population of mothers/women, so it is still easily possible the majority has a bias toward overly protective. This isn't to say they do have such a bias, only that those stats don't verify things ones way or another for that claim.