Just ignore the data.
Admittedly, these are bonobos, and not humans; additionally, it's on io9 which isn't a science blog, but a science fiction one. (The study itself is, tragically, behind a paywall.)
But it's clear that female-dominate societies are less violent than male ones, because females are more 'sensitive'.
Anthropologists have never directly observed a female-dominated society among humans, but many have speculated that such societies would be less violent than male-dominated ones. Now that postulate has been challenged by hard evidence. Bonobos, a primate species that is female-dominated and bisexual, have been observed repeatedly hunting and killing other apes in the wild.
But it's clear that female-dominate societies are less violent than male ones, because females are more 'sensitive'.
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