What is the purpose of a counterargument?

Nthe play macbeth by william shakespeare, the main character struggles against his own ambition to the throne of scotland. to gain the throne, he must kill many friends, start a war, and lose members of his family to madness. still, he pushes on in his desire to gain the throne. which type of conflict does this show? man vs. man man vs. nature man vs. self man vs. society