Humans certainly have capacity for violence - and all sorts of behaviors that go with that. That's not something that is in dispute, but we evolved as a highly social species who survived, when all other hominid groups died out, because we took good care of each other. Here are 2 other stories I've subsequently written that support that.
The overwhelming takeaway that I got was that most animals, particularly mammals, including ones who are considered to be highly aggressive such as chimpanzees, only kill each other under very specific conditions. In general, unless they can be virtually assured of doing so at very low risk to themselves, both human and non-human animals are much more likely to engage in alternatives to violence. Both have extensive conflict avoidance techniques as well as reconciliation habits.
"As it turns out it is more than a metaphor — social pain is real pain. With respect to understanding human nature, I think this finding is pretty significant. The things that cause us to feel pain are things that are evolutionary recognized as threats to our survival and the existence of social pain is a sign that evolution has treated social connection like a necessity, not a luxury. It also alters our motivational landscape. We tend to assume that people’s behavior is narrowly self-interested, focused on getting more material benefits for themselves and avoiding physical threats and the exertion of effort. But because of how social pain and pleasure are wired into our operating system, these are motivational ends in and of themselves. We don’t focus on being connected solely in order to extract money and other resources from people — being connected needs no ulterior motive." Scientific American
