The object of "Macbeth" is that of all literature: To express the human experience. Shakespeare portrays, as he does in all plays, characters who exemplify redeeming traits or those that are not to be admired.
Certainly, with "Macbeth" the reader/viewer learns of the treachery and "evil that men do" in an ambitious climb to power. The presentation of the consequences of giving up all for one's ambition is also part of the objective of this play. For instance, Lady Macbeth goes so far as to "desex" herself in her drive for her husband. As a consequence of this she goes insane.
There are always many lessons that readers/viewers can learn from reading Shakespeare.
The object of the play Macbeth is to demonstrate through events and occurances how destructive being over ambitious can be. In the beginning of this play Shakespeare shows Macbeth to be a loyal subject as as well as a soldier with outstanding abilities. He is admired by all around him including the King who rewards him with a title. Macbeth, being desirious of the throne, seizes his chance and plots with his wife to murder the King and take over the throne himself. His plan seems to succeed. However, a spate of murders follow as Macbeth sees it necessary to get rid of those he suspects or fears.He even had members of the slain Kings family murdered.
Shakespeare also demonstrates in the play that Macbeth's actions are not only horrific to those around him but that even nature iitself is shaken.The thunder and lightening at the opening of the play sets the unsettled scenes to follow . Macbeth and his wife lose their mental stability and even the dead are disturbed with the appearance of Banquo's ghost