Why did Macbeth kill the two chamberlains?

Macbeth's primary victim was King Duncan. But he also killed the King's two chamberlains. He felt the additional murders were necessary, to cast blame and to prevent any witnesses against him. In fact, he confessed to the murders when the King's corpse was found. He explained that he found Duncan dead, and couldn't control his righteous anger against the alleged killers.
Macbeth's primary victim was King Duncan. But he also killed the King's two chamberlains. He felt the additional murders were necessary, to cast blame and to prevent any witnesses against him. In fact, he confessed to the murders when the King's corpse was found. He explained that he found Duncan dead, and couldn't control his righteous anger against the alleged killers.