Well, because it is an invasion of privacy and it is rude to the other person.
The themes are grief, negativity, and depression. You can see this through the mood of the protagonist and the overall mood of the story.
Shakespeare makes Macbeth seem very strong and loyal to the king. Those adds to the drama because Macbeth quickly turns against the king by killing him.
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Simile and metaphor are the most common types of figurative language