Pasolini's
Salò, or the 120 Days of Sodom has some value as an adaptation of de Sade for modern times, specifically Italian Fascism of the mid-1940s and more broadly fascism, in general.
I see it more as an exercise in aesthetic decadence which can be interpreted as either a condemnation - or glorification - of aesthetic decadence. Of course, that goes for the rest of the films on this list and most other (pseudo)moralistic entertainment or "art" (whatever that is).
...as they say in both the cheapest and most expensive restaurants these days, "Enjoy!"
Salò o le 120 giornate di Sodoma (1975)
Salò, or the 120 Days of Sodom - Wikipedia, the free encyclopedia