This could make it easier for Macbeth by reducing some of the blame that could be placed on him for the evil deeds, when we have seen that Macbeth did not commit this crime acting under his own intentions; but rather Lady Macbeth's. Her from the crown to the toe top-full / Of direst cruelty (1.5.40 42 turning her into an unnatural creature like the witches, who are neither male nor female. The audiences perception of this would have been that Lady Macbeth was purely evil. His wife, with whom he once shared what seems to be a very loving relationship, kills herself as Macbeth prepares to face the rebel army. She would have carried out the murder herself had Duncan not looked like her father. The witches words were neutral. Murder becomes his primary tool of leadership.
She lost her influence along time ago when Macbeth became independent. Macbeth has a change of heart before he reaches home until his wife persuades him that it can be done safely. Macbeth is not a cold blooded killer otherwise he would not be feeling these emotions. Banquo knows, "i fear thou play'dst most foully for it" (3, 1, 2-3). Macbeth is very calculated; he really knows what he is doing, more so than in the murder of Duncan. We see the isolation of Lady Macbeth towards Macbeth when her only concern for his welfare is; 'You lack the season of all natures, sleep'. Macbeth knows the prince of Cumberland is "a step so that he can't become the king.
Macbeth evil is the opposite of humanity, the deviation from that which is natural for humankind, yet evil originates in the human heart. The character Macbeth, like the play itself, is a collection of contradictions. If ill, / Why hath it given me earnest of success / Commencing in a truth? this shows that Macbeth is not purely evil and that he has a conscience. 'That it was he in times past, that held you so under fortune. Her denial of her essential nature is unsuccessful.
Fate of Macbeth
Carter Beats the Devil
The fall of man in Macbeth
Evil in the Writings of Herman