The truth is that literature, particularly fiction, is not the pure medium we sometimes assume it to be. Response to it is affected by things other than its own intrinsic quality; by a curiosity or lack of it about the people it deals with, their outlook, their way of life.
As the capacity to coerce declines, it is natural to turn to control of opinion as the basis for authority and domination - a fundamental principle of government already emphasized by David Hume.