How does Macbeth's character change throughout the course of the play?

I
believe that 's character change is too extreme. From being a loyal subject and essentially a
good man, he becomes a terrible tyrant, and in the end he is behaving like a madman. It was not
logically necessary forto turn into such a hateful tyrant just because he committed a murder to
become king. Shakespeare made him a tyrant to justify the military intervention of the English
monarch. Asdescribes Scotland in Act 4, Scene 3:

Alas,
poor country,
Almost afraid to know itself! It cannot
Be call'd our mother,
but our grave. Where nothing,
But who knows nothing, is once seen to...