TD was nominated for four, Sweeney for three and won one. But that’s not the point. The point is that the Oscars consistently go to dark, twisted portrayals of wretched humans. Who needs more of that in their life?
Are you talking about acting awards? Actors love playing characters like that and it generally is the sort of acting that gets attention. The Best Picture winners tend to be fairly conservative (Unforgiven, Schindler’s List, Forrest Gump, Braveheart, Return of the King) with an exception here and there (American Beauty).