Macbeth: Witches Influence on Macbeth's Decisions In the Shakespearean play, "Macbeth," the witches influence on how Macbeth made his decisions played a crucial part in contributing to his eventual destruction. The witches were trying to create chaos by prophesying to Macbeth in order to get him to act. They planted the seed of evil in Macbeth's head that grew to dominate his mind. But it was Macbeth who made the choices that determined his fate. He was not forced to kill Duncan nor any of his other victims. But after he murdered Duncan, Macbeth lost his sanity. The witches were easily able to