Primal Instincts

Humans. Are they truly more sophisticated than the rest? I suppose it's true in some sense, being able to change the environment around us, creating structures, marvels of wonders, with our own hands. But are we really as intelligent and superior as the rest of the animals? Or have we still the instincts of them?
Take for example, the discrimination of women in societies. Sure, in developed worlds such as the United States and India, secularism and womens' education have lessened the sexism in their societies, but it still exists today. But why? Why discriminate women? How have these patriarchal societies come to be? I have a theory, and I'm pretty sure many other scientists (or human geographers) have already figured it out.
It all starts with the habits of animals. Usually, because of certain organs of females, the mother carries the responsibility of feeding the newborns after birth, while the father has to protect the family or go to hunt for food. This is natural, but if the population keeps getting larger, as it inevitably will under certain circumstances, the males will have to hunt for more and more food, thus depleting the available resources and thus cause competition to arise. Between species, different populations, or in the same population, it can vary, but the results could prove to be the same. So, when there is competition, there is naturally warfare; the two populations will attack each other for the resources, like when individuals fight over a mate. Now, warfare needs some sort of organization, otherwise things will really get out of hand, so this creates a need for a government, which will oversee the fighting, the resources, and any other issue in the population. Now, because the females in the population have the burden of caring for the young, the males are usually the ones who fight, so as a result, the males get the glory and recognition while the women are pretty much just seen as the child-bearers of the society. And so, the government gives more rights to the glorified males while oppressing the females, fearing that should they get killed, there would be less of a population to fight even more. Religions come about, which restrict females' role in society even more (such as Christianity and Islam) and this eventually evolves into women discrimination as we know it today. This is my theory, and I have not the tools, knowledge, nor contacts to experiment to see if it is true. This is also one example of humans acting on animal insticts. Also please don't be insulted, if you feel insulted.