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The explanation for this apparent madness is that the left — both the scribblers and the shock troops — bear all the characteristics of a mob, as set forth more than a century ago by the father of group-think, French psychologist Gustave Le Bon. No behavior of the left is mysterious if you’ve read Le Bon — or “Demonic.” In “The Crowd: A Study of the Popular Mind,” Le Bon observed that the “complete lack of critical spirit” prevents crowds from “perceiving … contradictions.”