Another month, another rationality quotes thread. The rules are:
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I suspect the polymathwannabe is referring to the ancient custom of war where after defeating your enemy, you go around and kill all their babies and their males, and take their women. Of course, that has nothing to do with religion one way or the other.
Regarding ordinary infanticide, that was also an ancient custom, approved e.g. by Aristotle. The practice had nothing to do with religion but had practical motivations. Areas that converted to Christianity put a stop to it.
Jane Goodall has some interesting oberservations regarding infanticide among chimpanzees in her book "Through a Window." While chimpanzees will attack females that are strangers to a group violently, their infants will only, and in rare instances, die as casualties, but not be directly attacked. Infanticide within a community has only been observed in a few cases and all perpetrated by the same female individual and her daughter. However, she concluded from their behavior that their reason lay solely in the meat of the hunted infants.