Before the panic about witchcraft in Salem, all of the power was in the hands of the men who were elected by other men to lead the town such as Reverend Parris. The women in Salem were second class citizens, and their opinions usually mattered very little. The men were the ones who made all the decisions about the town, and the church was also fully lead by men. The church had a powerful influence on people during that time. When fear of unholy witches became widespread, the church's influence increased even more. It began to seem like the town was run by a theocracy.
After the incident in which Betty apparently became possessed by the Devil, she, Abigail, and the rest of the girls who danced had the power to accuse any woman in Salem of being a witch. The church went from being directed by holy Reverends to being used as a means for a bunch of newly empowered women of the town to hang whoever they wished. Eventually, the greatly respected Reverend Hale withdrew his support for the witch hunting, but by then powerful members of the government were already fully convinced that the Devil was loose in Salem. After being repressed for so long, a small group of woman who finally had some power and influence unfortunately decided to abuse it.