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Yea well of course you believe that.
CNS Spectrums: The Neurobiology of Moral Behavior: Review and Neuropsychiatric Implications
"Introduction
For years, scientists and philosophers have proposed a sixth human sense for morality. Recently, there is increasing evidence that there is, in fact, an intrinsic morality network. The presence of a moral sense is consistent with a focus of human evolution on mechanisms of individual behavior that maximize survival in social groups. Evolution has promoted social cooperation through emotions against harming others, a need for fairness and the enforcement of moral rules, empathy and “Theory of Mind” (ToM), as well as other behaviors that feed into the concept of morality. ToM is the ability to appreciate the thoughts, feelings, and beliefs of others.
If there is a “moral sense,” then there should be specific brain mechanisms for morality as well as brain disordered patients with impaired morality. Convergent evidence that this is the case comes from studies of functional magnetic resonance imaging (fMRI) in normals, neurological investigations of sociopaths, and the examination of patients with focal brain lesions or with frontotemporal dementia (FTD). This neurobiological evidence points to an automatic, emotionally-mediated moral network that is centered in the ventromedial prefrontal cortex (VMPFC), particularly in the right hemisphere. Although this literature is still young, disparate, and heavily reliant on fMRI correlations, the convergence of evidence supports the presence of a neuromoral brain network. This report reviews this burgeoning literature and discusses the theoretical implications for brain-behavior relationships, and its clinical and legal implications. Although much of the presented evidence is still debated, a picture of moral neuroscience is beginning to emerge."
What I happen to "believe" is irrelevant where this is concerned.
As a matter of historical fact, practices like blood sport, human sacrifice, infanticide, cannibalism, and even pedophilia were not only incredibly common in many parts of the ancient world, but were often regarded as being being completely acceptable within a social context as well. A large part of the reason why all of those things went away is because of the spread of Abrahamic religions, and the moral prohibitions they enforce.
Sooo... Yea. Whatever "moral compass" human beings might happen to possess, it's apparently pretty damn flawed, and seems to benefit from having artificial boundaries in place (assuming that classically 'nice' behavior is even your goal in the first place, of course).