The observation you are referring to of a group of bonobos eating a deceased infant bonobo, taken from the mourning mother of the infant who had been carrying its dead body, and at the time of its cannibalization, a decaying body, for days, was an apparently unique, or rare, or, for sure, most uncommon, event in the context of the long history of observations by human researchers of bonobos in the wild and captivity. The cannibalization was initiated by another female bonobo, who, after having eaten some of the dead infant first, passed the corpse around to the other bonobos, including the mother, to share in the cannibalization (which they all did). Another single event of this kind for gorillas was indicated in the feces of two gorillas, which are vegetarians virtually exclusively. Only orangutans are known to occasionally engage in dead infant cannibalism. We must consider that there may be atypical individuals in any species whose cognition and behavior may vary strikingly from the standard or typical cognitive and behavioral patterns of nearly the whole of their species, just as is the case with humans. A dominant individual, especially a respected and/or formidable individual, engaging in such behavior may make it a momentary or newly adopted behavioral pattern in a social setting or community. There were the instances on the east coast of the U.S of police officers and later military officers having booked hotels for festivities and who ate and drank alcohol to excess and reveled and rampaged in the hotels, damaging hotel fixtures, and assaulting hotel customers and fondling women in the hotels for fun -- this is not normal or typical group police or military officer conduct on or off duty, although there are instances of rare groups of police officers having done other wrongful things in and to the public. If high ranking individuals in these situations initiate or sanction such conduct, subordinates and subordinate peers may be susceptible to join in. With respect to this anomalous bonobo cannibal behavior, the leader may have been similar to what might be diagnosed to be a psychopathic schizophrenic in human society. In addition or alternatively, bonobos may at some point following a death such as this, come to regard the corpse as no longer a bonobo, especially if the corpse is deteriorated or decomposed, and accept it as food or consume it as part of a religious ritual at such point. Nevertheless, science does not generalize the exception to be the norm or rule in characterizing a species or the typical behavior of the species, and, in light of the occurrence of the exception, does not disregard or marginalize the general state of affairs.