The societies described in the article have many dissimilarities with modern Western civilization. Why attribute the level of mental illness (a somewhat difficu

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 "level of coercion" (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.