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1. He is the king's subject and is expected to be loyal to him.
2. He is the king's host. He should protect the king, Not bear the knife myself.
3. Duncan is a goodly king and God will not like it if he is killed, Besides, this Duncan. Hath borne his faculties so meek , hath been. So clear in his great office, that his virtues. Will plead like angels.
4. Bonus- Macbeth wants to enjoy his new role of Thane of Cawdor. He is a respected man around Scotland.