>anyway, sade was not a philosopher, merely a very cruel pervert
Okay, do agree. But only because I assume you aren't familiar with the philosophical tradition of ancient Greece and how they arranged their treatises.
If you could have read at least Plato's Symposium you could have seen that de Sade's works somehow have the similar way of injecting philosophical reflections between the scenes of bestiality. The way the ancient used to talk about philosophy isn't how modern people do see it nowadays, they had pretty simple discussion about simple things like pleasure or desire. And they didn't depict raping women in the treatises only because they like to rape boys. And nobody cares about boys nowadays, so nobody calls them schizos.