This is a highly editorialized title which does not reflect the main point of the paper, whose actual title is Lethal aggression in Pan is better explained by adaptive strategies than human impacts.
Title now changed, I notice.
Title was: "Male Chimps commit 92% of chimpicides and are 73% of chimpicide victims".
But note that it's up to the community to decide what the interesting points of a study are, not necessarily the authors.