how foul is the fair?

we generally tend to forget that macbeth was a tragic figure appearing on stage and not a real person so we compacently associate ourselves with his situation and what we would have done if we were in his shoes.but the fact remains that he was a tragic protagonist quite quite different from us.
whatever macbeth did, was triggeres by his own emotional logic and once the process of evil began he couldnot return-he had to see the grim process through to its grimmer conclusion.and the conclusion is where we the audience come into the play.the anagnorisis attained by macbeth dawns on us as a figment of the larger vision of the human condition