Shakespeare presents that heroism is easily corrupted. Any honour or glory is corrupted into darker forces of evil. This creates emotions of both pity and disappointment for the fallen hero.
Shakespeare introduces the idea that heroism is only a facade for darker, evil forces. Shakespeare suggests that patriotism and heroism will not survive for long.
Shakespeare presents the awful consequences of betraying the expectations of the time. Macbeth's downfall is a punishment for his behaviour.
Shakespeare presents us with the conflicted character of Macbeth: there is a battle between his ambitious desire for power vs his conscience. We see Macbeth's tragic transformation from hero to villain, as a result of the weakness of his mind.