There are many reasons why John Proctor is a tragic hero. He committed adultery with his servant, and thought he can hide this fact. We can find his hubris through this. But, finally he realized his mistakes and tried to treat well Elizabeth, and also tried to fix the things that he messed. It is one of the features of tragic hero that he is neither entirely virtuous nor entirely evil. Also, a tragic hero evokes our pity because, not being an evil person, his misfortune is greater tragedy than he deserves and is disproportionate to his “flaw.” In this point, Proctor suffered death for his mistake, which is much more harsh than his mistake. His ending is sad enough to evoke our pity. At last, a tragic hero recognizes the wrong he has done
