The document analyzes how Macbeth's downfall is caused by three main factors: 1) the prophecies told by the witches that trigger Macbeth's ambition, 2) Lady Macbeth's manipulation and influence that corrupts Macbeth's judgment, and 3) Macbeth's excessive passion and ambition to become king at all costs, even committing murder. These intertwining factors drive Macbeth to increasingly violent acts like murdering King Duncan and Banquo in order to obtain and maintain power, ultimately leading to his tragic downfall.