We may have started out that way before we gained decent technology, but we shape ourselves and our environment rather rigorously these days and that will only increase, unless there is some major catastrophe.
Humans Evolving More Rapidly Than Ever, Say Scientists | Science | WIRED
Our environment has changed dramatically. We, however, have not.
At the end of the day, we're still the same cavemen we ever were. That's kind of exactly the problem here.
Our instincts don't know how to effectively deal with the modern world, and it changes far too quickly for our species to adapt.
Our ingrained nature changes with progress. Also there is a difference between an ingrained nature that matters and one that does not. For example, the idea of legality, rights, and civilization are fairly new innovations that have only been around for a few ten thousand years. Yet now they are considered by many to be natural.
Our way of thinking is far from natural,
likely changed very recently by modern education. Yet the adaptations are highly successful so far (we live longer and healthier than ever). Human nature really isn't something that is set in stone and there has been shown to be a lot of wiggle room. Its not the hard and fast rule that you imagine it is. Like all living organisms, humans are an adaptive species and human nature changes in response to pressures, that's a feature of biological systems.
What isn't natural of today can be quite natural for tomorrow, this is why we shouldn't look solely to the natural but be willing to shape and mold our own natures as we have done for at least the last thirty thousand years.
To the contrary, I'd argue that human nature is essentially static, and that there's nothing intrinsically "new" about how we view the world today versus the past.
All the old staples of human, and even primate, civilization - hierarchy, gender roles, tribal identity, territoriality, war, profit motive, sex drive, and etca - are all still in place in terms of basic principle. They have simply adapted on a superficial basis to meet the needs of our modern environment.
Frankly, it wouldn't appear that they have even done so in a particularly efficient or productive manner anyway. Modern society is rife with problems, largely stemming from the fact that our instinctual means of addressing certain circumstances are struggling to keep pace with how the world has changed.
The Japanese and Europeans, for instance, are probably having more sex now than they ever have. However, they are also presently well on their way to extinction either way regardless, simply because human instinct has no way of accounting for the impact artificial inventions like the pill have had upon our fertility.
Trying to argue that fundamentally "unnatural" or "counter-instinctual" circumstances can be overcome through "willpower" or "re-education" alone is exactly the same trap the Marxists fell into a century ago. I'm sorry, but it didn't work any better for them in that era than it is going to work for us today. Human beings simply don't work like that.
The only method by which you are going to achieve the results you are advocating here is by fundamentally changing humanity, and human nature, itself through direct, and physical means. Frankly, that opens an entirely new kind of "Pandora's Box" in and of itself.