" Nowhere does he blame the witches. It is only his ambitions that made him kill Duncan. All the witches did was look into Macbeth's mind, discover his desires and start a fire within him, with fuel that had already been provided. They simply managed to start the ball rolling.
Lady Macbeth was also a major influence in Duncan's murder. Upon learning of the events between Macbeth and the witches, Lady Macbeth is driven by her own selfish ambitions to kill Duncan. In Act I Scene 5, Lady Macbeth says "Which fate and metaphysical aid doth seem To have thee crowned withal." This conveys that Lady Macbeth doesn't believe in fate and that only killing Duncan will make Macbeth King. She thinks up of a plan to kill Duncan and approaches Macbeth with the idea. She was the 1st person to openly to talk about killing Duncan. After their discussion, Macbeth weighed up the reasons to kill or not kill Duncan and had decided against the deed. Lady Macbeth immeadietly appealed for a change of mind. Lady Macbeth called her husband a coward, drunk and challenged him to prove his love to her by killing Duncan. If it wasn't for Lady Macbeth's influence, Macbeth certainly wouldn't have killed Duncan.
Deliberation and conflicting thoughts are another aspect of Macbeth which clearly shows all decisions were made by free will. If it was Macbeth's fate to become king by killing Duncan, he wouldn't have deliberated or have any thoughts opposing the deed. Yet Macbeth was constantly deliberating with his wife on whether to kill Duncan or not. During their deliberations not once is fate mentioned. In fact throughout the whole play fate and destiny is hardly mentioned at all. Macbeth even raises the prospect of failing to do the deed. Macbeth's soliloquy in Act I Scene VII lists various reasons why not to kill Duncan. Some of things he said were "we"d jump the life to come," meaning we"d be gambling on eternity, "I am his subject and his kinsman," meaning that Macbeth should be protecting Duncan as he's the guest and also "this Duncan Hath borne his faculties so meek, hath been So clear in his great office" meaning Duncan is a great person.
