The evolution of modern man is studied in paleoanthropology. Bone fossils tell of structural changes in species, but not of mental development. The mind is not retained in the soil sediments. There is still a road to the ancient mental landscape. From time to time, our psyche shows a lost stage of development. It appears on the eve of adulthood and we have time to notice that I, the will and the logical reasoning disappear. Relationships of things lose their meaning. Morality is questioned. Feeling happy and balanced and the world feels ready. This is sometimes called a mystical experience, but it is above all a message of our own body and part of the millions of years old psychic mechanism of growing up. Psychedelics can also cause it artificially. Experience is the decision of our growth, that is where adulthood should begin. But because civilisation sees growth as a process, it remains a mystery. For some reason, the experience ends quickly.
Unfortunately, we don’t understand anything about life
The hypothesis of genetic defect assumes this termination is an error somewhere in our growth mechanism. The failure means that all people, including those who never experience the same, have a hereditary growth disorder: some have time to experience a bit of it, but mostly nothing. So we don’t grow up because we don’t detach ourselves from the psychological protective mechanisms of adulthood like previous human species. If real adulthood worked, the mechanisms supporting growth (e.g. volition, cognition, and ego) would disappear. They would also make many learned things disappear: learning and memory skills would be replaced by instincts. Man would experience the world independently without aids that would simplify our observations. The mechanism of consciousness, which is a cornerstone of civilisation, is intended only as temporary protection for adults. The function of consciousness is really to simplify a complex world for a child. Nature and people would certainly suffer less if we accepted ourselves as we are and did not try to pretend to be something we are not.