Distrust of the unfamiliar and the foreign is a natural survival mechanism for most species, including the human species. But, if empirical evidence is worth anything, a reflexive distrust of the foreigner cannot be said to be equally benign. Distrust sows fear. And fear plays in the hands of demagogues and can turn into a contagious pathology with numerous undesirable consequences.
Image: http://www.newgeography.com