If the topic is "is it possible to change society's views through film" then the answer seemingly must be a straightforward yes, least an entire advertising industry be shown to be fruitless.
Given such a reality, is it then possible to potentially damage society through the showing of such films as might be currently considered counter to society's normative values?
Such an assumption must necessarily be secondary to inquiring after what form such damage might take.
How might society be harmed by such films?
How might one achieve a paradigm shift in the viewing audience after repeated showings?
Perhaps it might be related to mankind's seeming interest in novelty. For what might be more interesting than the exploration of something potentially new and, perhaps even, heretofore, forbidden?
How might the maintaining of the special be possible if not kept apart from the mundane? For in projecting the special to the extent that it might become mundane what then might replace the special? Is such not at the root of the radicalization of the special to the degree that it must depart ever further from a normative path?
Is not the first slasher film one views necessary more thrilling than the 10th? Is one not commonly left seeking that which might yet be nearer the edge after becoming accustomed to more of the same? Given that desensitization is always possible, whether in the viewing of murder or pornography, if one truly wishes the same thrill from either does one not necessarily require a level of restraint so as to not overly dull the senses?
If such a thing might be branded as virtue or morality, so be it...for once the thrill is gone does it not require an investment in abstinence in order for it to be slowly rekindled?