In Salem, Massachusetts 1692, a group of girls in the town were caught doing strange things in the forest. They claimed that it was only dancing but are accused of witchcraft. This leads to the accusations against multiple women for witchcraft.
Act I the Crucible
Then let you come out and call them wrong. Did you consult the wardens before you called this minister to look for devils?
John Proctor's motivation was to prove the public's witch hysteria was unreasonable and that they should not jump to conclusions that people are possessed.
Abigail wanted John to leave his wife so that they can be together.