Social animal species with a strong drive to be part of the group are still quite happy to exterminate other groups of the same species. Just a random example i

Social animal species with a strong drive to be part of the group are still quite happy to exterminate other groups of the same species. Just a random example is https://en.wikipedia.org/wiki/Gombe_Chimpanzee_War https://en.wikipedia.org/wiki/Gombe_Chimpanzee_War , but there are many others in different species - illustrating that being socially motivated does not mean avoiding organized slaughter of your fellow species-mates.