There are many levels of authority within the world of the Crucible. Early on, the Reverend Parris is the sole authoritative voice in Salem, as the minister and a graduate of Harvard College. He is supplanted by the arrival of Reverend Hale, who derives his authority from books and learning, which are then further supplanted in turn by the courts and its officials. Meanwhile, individualists like Proctor and Giles Corey rankle under these layers of authority – Proctor had long rejected Parris's preachings, and Corey made the authority of the law work for him as a constant plaintiff. But being an outlier is seen as dangerous in this society. Indeed, dissent against official authority is akin to being an anarchist at best and an agent of Satan at worst. Proctor and Corey are the two most modern figures in the play for their willingness to push back against the extreme authority of the courts. For this, however, they also suffer greatly.
Miller identifies the witch hunt as an opportunity for the repressed members of Salem society to publicly proclaim both their own sins and the sins of others. Guilt has been bottled up at home in this community, and the airing of sins and grievances is a relief to those previously without an outlet for confession. Guilt motivates not only the witch hunts themselves, but also the behavior of several principal characters. Proctor is haunted by remorse over his infidelity, while Reverend Hale works to undermine the court that he helped create as penance for his sins. The ultimate irony of the Salem witch hunts is not only that the sins of the trials quickly outpaced the original crime, but that there was no original crime to begin with. Indeed, the abstract concept of sin was made concrete through compounding avoidances of guilt.