How do the tragic qualities of the play Macbeth contribute to the story's larger message?

The desire for power often leads to corruption. Depending
on the situation, that corruption will manifest in different ways. Macbeth and Lady
Macbeth conspire to make him king. The only way to do this is to kill Duncan. Just like
one lie leads to another, Macbeth concludes he must keep on killing to protect his place
in power. He is afraid of someone discovering his crimes and this fear is accompanied by
his guilt which begins almost immediately after he has killed Duncan. The tragedies are
the murders; plain and simple. You could also say that Macbeth’s transition from loyal
subject to murdering tyrant was also a tragedy in itself and because it led to his and
Lady Macbeth’s deaths.

The witches’ visions of the future
could be prophetic or they might be suggestions. In either case, Macbeth is quick to
believe in them, so he’s easily convinced to do the wrong thing. Notice that he’s also
easily manipulated by Lady Macbeth. The tragic qualities, as in the tragic choices he
and Lady Macbeth make, show how greed leads to corruption, corruption leads to crime,
crime leads to fear and guilt and this leads to further crimes. Tragedy, corruption,
fears and guilt all feed upon themselves. The cycle cannot be broken by more
tragedy.