Humanity's existential crisis is not due to the "Divided Brain" but instead to the principle of power.
The only thing necessary for a society to become dysfunctional is to allow a minority to accumulate enough power to influence how society is organized.
In time, they will create a legal system to protect them and a moral code to glorify them.
Most people attracted to power have narcissistic, sociopathic, or psychopathic tendencies; some are megalomaniacs who will resort to any means to achieve their ends.
One way or another, through the profit motive and the imposition of manufactured scarcity, the powers that be coerce us into adapting to a reality that we intuitively know to be bad.
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