“I always thought that a strong protective and nurturing relationship with a child is instinctive.”
Sorry, but there is no such thing in humans as “maternal instinct”. In fact, humans are the only creatures on this planet totally devoid of instincts. There is nor biological clock or change in season that dictates out behavior. We must learn everything, even child-raising. And after reading about these despicable women it seems apparent that the lessons didn’t take on these animals...
This can be objectively documented by detecting physiological changes: blood flow in certain areas of the brain and/or to certain parts of the body, electrical activity measurable n the brain, and the output of behavior- and mood-modifying hormones (such as adrenaline, dopamine and serotonin. as well as prolactin and oxytocin.) In humans, I grant you, learning can be crucial. But the instincts are still there to support the correct learning.