How does Macbeth go from good to bad?
One can trace Macbeth's downfall to the moment he receives the news that he is the Thane of Cawdor, which confirms the Three Witches' initial prophecy. Before Macbeth meets the Three Witches on the heath, he is portrayed as a loyal follower of King Duncan and a courageous warrior, who successfully defeats the Norwegian Army in battle. After the Three Witches refer to Macbeth as the Thane of Cawdor and future king, he immediately begins contemplating the murder of King Duncan to attain the title.
When Macbeth returns home, his wife convinces him to commit regicide and plans Duncan's assassination. Despite knowing the consequences, Macbeth cannot contain his ambition and ends up murdering the King. After Macbeth kills King Duncan, he realizes that he must murder Banquo and his son in order to cement his legacy. Macbeth then hires assassins to murder Banquo, and he begins to suffer from hallucinations...
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he kills and does whatever it takes for power