Herd Instinct and Sympathy for the Possessed

Herding among all life forms is a strategic organization and adaptation to external stimuli.  Tigers have no need in numbers or increased competition for food.  The prey of tigers adapt by increasing their numbers thru herding and enhanced reproduction.  Today we will ask if humans have mental predators which force us into a mental herding instinct.  And we will also ask ourselves if some humans become mental predators and, if so, why?