"To what extent are the boundaries between good and evil blurred in Shakespeare's 'Macbeth'?"

If the view that ‘the boundaries between good and evil are blurred’ were applied to Macbeth, we would expect to see characters that are portrayed as good doing evil things, for example Macbeth, Banquo and Macduff. We would also expect to see evil characters doing good things, for instance Lady Macduff displaying positive qualities, and good events followed by evil events and vice versa. If the view were not applied to ‘Macbeth’, then we would expect to see a clear distinction between good and evil, for example the supernatural gothic witches and the innocent naïve Duncan. The main distinction between good and evil that Shakespeare does create in the play is the striking contrast between the witches and the innocent king Duncan. The witches are immediately associated with the supernatural as gothic auditory and visual symbols, respectively ‘thunder and lightning’ mark their entrance. Contrastingly, Duncan’s entrance on stage is marked by sounds of trumpets, ‘alarum within’, that are associated with royalty and greatness. The sequence of scenes also serves to enhance the direct contrast between good and evil, as Duncan is the first character to speak after the witches. Moreover, the contrasting descriptions of the weird sisters and Duncan show their different nature which are complete opposites. Banquo describes the witches as ‘withered’ and ‘wild in their attire’ [...]