“Propaganda is characteristically part of the mechanism,” he writes, “by which people become deceived about how best to realize their goals, and hence deceived from seeing what is in their own best interests.” This is achieved by various time-tested means — by appealing to the emotions in such a way that rational debate is sidelined or short-circuited; by promoting an insider/outsider dynamic that pollutes the broader conversation with negative stereotypes of out-of-favor groups; and by eroding community standards of “reasonableness” that depend on “norms of mutual respect and mutual accountability.”