What motive prompted Macbeth to each of his murders so far: Duncan, the grooms, Banquo, and Macduff's family?

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The one thing that seems to motivate Macbeth is his "vaulting ambition:" his desire to become and remain King of Scotland.

In Shakespeare's Macbeth , Macbeth must kill the King if he ever hopes to take the throne for himself. He murders the grooms to make sure they are blamed...

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The one thing that seems to motivate Macbeth is his "vaulting ambition:" his desire to become and remain King of Scotland.

In Shakespeare's Macbeth, Macbeth must kill the King if he ever hopes to take the throne for himself. He murders the grooms to make sure they are blamed for the King's murder and cannot defend themselves, thereby casting doubt on Macbeth (especially as the murder occurs in his home).

Banquo was present when the witches delivered their prophecies to Macbeth, and it is only a matter of time that the honorable Banquo starts to question Macbeth's part in the King's death.

Macduff's family is killed for two reasons: Macduff has turned his back on Macbeth, letting this tyrant know that he does not support him and his murderous behavior. In fact, Macduff travels to meet with Malcolm, Duncan's son and heir apparent, leaving his family unprotected. I believe that by this point, Macbeth is also a little mad. It serves no purpose to kill Macduff's family, as it will not convince Macduff to change his mind and return home to support Macbeth, but he does so anyway.

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