Proctor's character contains a caustic blend of pride and self-loathing, a very puritanical combination indeed. On the one hand, he takes pride in his farm and his community. He is an independent spirit who has cultivated the wilderness and transformed it into farmland. Furthermore, his sense of religion and communal spirit has led to many public contributions. In fact, he helped to construct the church in town.
His self-esteem sets him apart from other members of the town, such as the Putnams, who feel one must obey authority at all costs. Instead, John Proctor speaks his mind when he recognizes injustice. Throughout the play, he openly disagrees with the actions of Reverend Parris, a choice that ultimately leads to his execution.
Despite his prideful ways, John Proctor describes himself as a "sinner." He has cheated on his wife, and he is loath to admit the crime to anyone else. There are moments when his anger and disgust towards himself burst forth, such as in the climactic moment when he exclaims to Judge Danforth: "I hear the boot of Lucifer, I see his filthy face! And it is my face, and yours."
Proctor's flaws make him human. If he didn't have them, he wouldn't be a tragic hero. If the protagonist were a flawless hero, there would be no tragedy, even if the hero died at the end. A tragic hero, like John Proctor, is created when the protagonist uncovers the source of his downfall. When Proctor accomplishes this, he has the strength to stand up to the morally bankrupt society and dies in defense of truth.