To viewers in 1960 this mostly seemed a rather turgid and unappealing tale of a bigot's reform, compromised by its trashy atmosphere. The key to the film, I believe, is Bunuel's admiration for the writing of the Marquis de Sade. The Zachary Scott character has a whole host of unexamined prejudices, not merely a racial one-- and when that one tumbles, his mind is liberated in all directions. The fact that this includes being "freed" from conventional sexual morality is the Sadean aspect of it-- as in A Clockwork Orange (but no other film that I can think of besides these two), true freedom is by no means an entirely positive or benevolent thing.