The American experiment is fragile. It has always been fragile and always will be fragile because it is so extremely unnatural. ‘Unnatural’ in this context means in conflict with human nature. Jonah Goldberg has described the fragility of the American system by comparing it to a garden hacked out of a tropical jungle. A garden surrounded by jungle is unnatural. The gardeners must tend it with unremitting care lest the jungle return.
Treating our fellow human beings as individuals instead of treating them as members of groups is unnatural. Our brains evolved to think of people as members of groups; to trust and care for people who are like us and to be suspicious of people who are unlike us. Those traits had great survival value for human beings throughout millions of years of evolution. People who were trusting of outsiders were less likely to pass on their genes than people who were suspicious of them. People who were loyal to their tribe were more likely to pass on their genes than people who stood apart.
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