How was Macbeth's fall from grace a tragedy?

Shakespeare presents an image of Macbeth originally as a hero, a role model of courage and bravery. However his indiscernible fascination with darker forces, portrayed by the witches, and whilst he is aware of the treachery in his subsequent actions throughout the play, his ambition engulfs his better judgement, where he contributes to his downfall from such greatness, and thus his character is human, enhancing such a tragedy. Macbeth experiences a sudden disastrous reversal in …

…such factors, involving elements of catharsis, as well as a sudden reversal in fortune for the protagonist. The circumstances beyond Macbeth's control also contribute to his collapse, thus his disgrace was premeditated, and the pity exploited amongst the audience for Macbeth allows for a purgation of emotion, leading to the belief that the tragedy's conflicts were a result of human flaws and perhaps his death was whilst deserved for his actions, perhaps not his beliefs.