Shakespeare presents kingship as a moral responsibility that, when respected, brings harmony and order to the kingdom. Through the contrast between King Duncan’s benevolent rule, Macbeth’s tyrannical usurpation, and Malcolm’s rightful leadership, Shakespeare explores the consequences of legitimate versus illegitimate power, and critiques ambition without morality. The play emphasizes that legitimate kingship is rooted in virtue, justice, and moral integrity, while illegitimate and violent usurpation leads to chaos, disorder, and ruin.