What are some reasons why John Proctor is both a good man and a bad man?

John Proctor can easily be seen as both a good and bad man by different characters throughout The Crucible. 

Most obvious is the fact that John had an affair with Abigail Williams, a much younger girl that worked in his home. 

Another way in which John may seem like a bad person is when considering his Christian habits. As a Puritan, he was expected to be dedicated and disciplined when it came to his religion. However, Hale discovers and questions the fact that he doesn't attend church every Sunday, that only two of his three sons are baptized, and that he cannot recite all ten of the Commandments. 

On the other hand, John Proctor's good qualities outweigh his bad. He is a law-abiding citizen that works hard on his farm. He loyally chooses his marriage over an affair with a Salem girl. He pushes forward to help save the wives of his friends even after he finds out that his own wife is safe for at least a year due to a pregnancy. In the end, he ultimately gives his life for those who have chosen to be honest and pure in the midst of the corruption and chaos. He refuses to give their names when asked if he saw them with the devil. In that case, the judges refuse to allow him to save himself. 

If nothing else, John chooses to leave the world with at least his name since he knows he has nothing else left. He ends up being a modest, selfless, honest Christian.