Macbeth Was Responsible For His Own Downfall

Macbeth is the driving force
behind Macbeth’s downfall

Lady Macbeth? The driving force behind Macbeth’s downfall? Certainly not. Macbeth was completely and solely responsible for all the acts of great evil which were to lead to his downfall, and to even suggest the blame can be shifted on his wife is ludicrous.
From his very first meeting with the witches, Macbeth’s mind became instantly plagued with thoughts of murder and treachery. The guilty start that Banquo noticed:

"Good sir, why do you start, and seem to fear
Things that do sound so fair?…"

showed us that the thought of murder was already at the back of his mind. This showed us that Macbeth could not have been as honourable and trustworthy as people believed him to be, given that if he had had but a shred of integrity, murder would have been the last thing on his mind. The witches cannot corrupt the virtuous (like Banquo), they can work only on the evil that they already find in their victim’s mind. At this point, Macbeth (and everyone else), was not aware of this evil inside of him, which is why he was so horrified by the hideous imaginings that spring to mind. He was afraid of speaking of his "black and deep desires" openly, even to himself. For this reason, he sends a letter to his wife, explaining the situation, hoping that the thought of murder would cross her mind, and he won’t have to be the one to bring it up. On receiving the letter, Lady Macbeth’s first thought (as Macbeth had hoped it would be) was one of murder. She was just as ambitious, if not more so, than her husband, so much so that she would do anything, even conspire to commit murder, to get what she wanted in the end. However, she was not an evil woman, which is why she felt the need to call on the powers of darkness to aid her in what she was about to do:

"…………………………Come, you spirits
That tend on mortal thoughts, unsex me here,
And fill me from the crown to the toe top-full
Of direst cruelty; make thick my blood "

This shows us that she doesn’t possess enough cruelty for the task she was about to carry out, and she wasn’t as strong as she would like to be.
Later on (Act 1 Scene 7) Macbeth started to have some serious doubts about the dreadful deed he was planning. He still very much wanted to be King, but his conscience was getting in the way of his "vaulting ambition". However, his wife managed to reassure him that all will be well, and he weakly submits. Nevertheless, it is absurd to suggest that Lady Macbeth was responsible for Macbeth’s decision to kill the King. If Macbeth had not wanted to kill the King, he wouldn’t have, regardless of any amount of bullying from his wife. He knows that he really wants to kill Duncan, it was his initial thought when he first encountered the witches. However, he didn’t like to think he was capable of such atrocities.
It was in Act 2 Scene 1, that Macbeth starts to show signs of acute distress and strain, and is alarmed by the dagger his imagination creates. However, towards the end of the scene, he seems to look back on the horror of the moment with enjoyment, and he even allows himself a moment of grim humour:

"………………….the bell invites me
Hear it not, Duncan; for it is a knell
That summons thee to heaven, or to hell."

In Act 2 Scene 2, we see further evidence of the fact that Lady Macbeth is not as strong as she seems on the surface, she needs to drink to give herself courage. She also mentions that she would have done the deed herself, if Duncan hadn’t resembled her father while he slept. After Macbeth has done the deed, he realises what a terrible crime he has committed, and becomes confused and irrational. However, as in all the other scenes when Macbeth has being scared or confused, Lady Macbeth takes over. It’s as if she knows she has to be strong for the both of them, and she always does her best to restore Macbeth’s confidence when he is feeling