What are your thoughts on Sirius' treatment of the house elf? Does the elf bring it upon himself? Is Sirius being unfair? Could he have been nicer to Kreacher? Would he have treated all house elves similarly?

Quote to consider: "If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals." What do you think this says about Sirius' personality based on how he treats Kreacher, his 'inferior'?