"Although this evidence does not definitely solve the puzzle of human nature, it does give us evidence we may use to solve this puzzle for ourselves—and our solutions will likely vary according to how we define “human nature.” If human nature is something we must be born with, then we may be neither good nor bad, cooperative nor selfish. But if human nature is simply the way we tend to act based on our intuitive and automatic impulses, then it seems that we are an overwhelmingly cooperative species, willing to give for the good of the group even when it comes at our own personal expense."
"Human nature refers to the distinguishing characteristics—including ways of thinking, feeling and acting—which humans tend to have naturally, independently of the influence of culture. The questions of what these characteristics are, how fixed they are, and what causes them are amongst the oldest and most important questions in western philosophy. These questions have particularly important implications in ethics, politics, and theology. This is partly because human nature can be regarded as both a source of norms of conduct or ways of life, as well as presenting obstacles or constraints on living a good life. The complex implications of such questions are also dealt with in art and literature, while the multiple branches of the humanities together form an important domain of inquiry into human nature and into the question of what it is to be human."
My Own Thoughts...
This is the core of all our problems.
How can we not agree on what Human Nature is?
Perhaps the people who are fighting the most obvious definitions feel that it would be to hard to follow, so they fight.
Which really makes things so much harder.