Why in macbeths opinion is the murder of Duncan so wrong?

Macbeth does not initially believe the murder of Duncan to be so wrong. In fact, he is tempted by the witches' prophecy and his own ambition to commit the crime. However, after he kills Duncan, Macbeth begins to feel guilty and remorseful. He is haunted by hallucinations of Banquo's ghost and descends into madness. In his opinion, the murder of Duncan is wrong because it violates the natural order of things, it is a betrayal of trust, and it leads to his downfall.