The societies described in the article have many dissimilarities with modern Western civilization. Why attribute the level of mental illness (a somewhat difficult thing to measure in a primitive society) to the &quot;level of coercion&quot; (an extremely difficult thing to measure in any society)? Why not correlate it with the number of cars, or the number of zoos, or the average diet? Such cherrypicking is generally a strong indicator of a pre-existing bias.