1. Shakespeare utilises the character of Macduff to restore order to the play, by ensuring that it is Macduff who brings an end to the tyrannous reign of Macbeth, rather than Malcolm
2. Macduff has the strongest reason to kill Macbeth: revenge
3. This killing from emotion is perceived as more acceptable by the audience
4. This reveals the ambivalence and double sense of the witches' prophecies and forces Macbeth to realise his mistake in trusting them
5. Macduff is symbolic of a bringer of truth and he calls Macbeth what he is - "tyrant" "hellhound" "bloodier villain"
6. He brings truth to the deception that has been Macbeth's reign, exposing him for what he is and purges Scotland of its illness