Nope, it's not human nature in the slightest. Human beings are genetically wired to cooperate and support each other. Little babies will share food, even if they are hungry. Recent culture is what has taught us to behave this way towards each other. For most of human history, taking care of the whole tribe or community was the primary survival strategy.
"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. "
In fact, the social and class stratification of patriachy is such a destructive way to behave that ironically, it caused that sort of social system to spread.
“In a demographic simulation that Omkar Deshpande, Marcus Feldman and I conducted at Stanford University, California, we found that, rather than imparting advantages to the group, unequal access to resources is inherently destabilising and greatly raises the chance of group extinction in stable environments. This was true whether we modelled inequality as a multi-tiered class society, or as what economists call a Pareto wealth distribution (see “Inequality: The physics of our finances“) — in which, as with the 1 percent, the rich get the lion’s share.
Counterintuitively, the fact that inequality was so destabilising caused these societies to spread by creating an incentive to migrate in search of further resources. The rules in our simulation did not allow for migration to already-occupied locations, but it was clear that this would have happened in the real world, leading to conquests of the more stable egalitarian societies — exactly what we see as we look back in history.
In other words, inequality did not spread from group to group because it is an inherently better system for survival, but because it creates demographic instability, which drives migration and conflict and leads to the cultural — or physical — extinction of egalitarian societies.”
