Final answer:
After Duncan's death, Macbeth views killing as often necessary to maintain power and eliminate threats, marking a significant shift from his initial hesitation.
Step-by-step explanation:
The question concerns the character development of Macbeth in Shakespeare's play, specifically after the death of Duncan. Initially, Macbeth experiences doubt and hesitancy, capturing a conflict between his ambition and morality.
This is evident in his soliloquies, where he ponders the consequences of murder and reflects on the trust and hospitality he owes Duncan. However, as the play progresses, Macbeth finds that murder becomes an oft-used tool to maintain power, indicating a radical shift from his initial compunctions.
Lady Macbeth plays a significant role in this transformation by challenging his courage and manhood, ultimately persuading him to commit regicide. After Duncan's death, and under the weight of his ambition and subsequent paranoia, Macbeth views killing as often necessary—a means to secure his position and eliminate threats to his throne.