The question is comparing the man in two different timelines:
Timeline 1 i.e. Preagricultural Society
Social Roles were few, could be predicted for each phase. Therefore, interpersonal relations were stable and predictable.
Timeline 2 i.e. Modern Society
Social Roles are in thousands and lifestyle require that each of us fill those roles. Therefore, relations will not be so stable.
(A) modern society is characterized by greater injustice and unpleasantness than were preagricultural societies
...
Timeline 1 i.e. Preagricultural Society
Social Roles were few, could be predicted for each phase. Therefore, interpersonal relations were stable and predictable.
Timeline 2 i.e. Modern Society
Social Roles are in thousands and lifestyle require that each of us fill those roles. Therefore, relations will not be so stable.
(A) modern society is characterized by greater injustice and unpleasantness than were preagricultural societies
...


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