Now, ordinarily there is really nothing wrong with merely recognizing differences between groups, merely identifying Us and Them. Similarly, there is also nothing wrong with favoring one’s own group. But the problem is that the evolutionary forces and pressures that acted to shape the architecture of the human brain did not stop there—we do not only form an automatic positive bias toward our own group, but we also have an instinctual negative bias toward other groups. As soon as we categorize an individual as belonging to Us or Them, the brain continues to process that information by
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