Macbeth and Philosophy

Does injustice ever make anything better, even for the unjust man? And what about his victims? Is there justice for them--when, where, and how?

PLEASE NOTE: At about 33.5 minutes, there is some technical problem. The words go something like this: “Oh, thank God. Macduff cut off his head. The murderer got killed. But is there really enough justice for Duncan, Banquo, Lady Macduff, Macduff kids?”