As a result, it can be maintained from both perspectives. I would also like to note that the opinions I am using are general similarities between researchers in each field. Rather than attempt to discuss all of them I just drew conclusions and incorporated them together. Biologists would tend to believe aggression is not instinctual. For our purposes, instincts are those similar to involuntary desires, such as, eating, sleeping, and mating.
Aggressive behavior results from the constant threat of nature.
Eventually, basic logic and reasoning skills force people together into communities. This new intellect gives way to self-identification of groups or individuals, which allows them to differentiate themselves from both other species, as well as other people and groups. Inevitably, inequalities arise, at least through the species perspective, between species and people. This, in turn, allows for social environmental issues to surface among human groups. Advancement in the species due to human ingenuity, begins to eliminate the constant threat of nature.