You might want to begin by mentioning Reverend Hale's gung-ho attitude when he first arrived in Salem. He was more than ready to pull out his little book on witchcraft and nail those witches to the wall..... at least until he realized things were not at all what they appeared to be.
Then, you might want to move onto the people in Salem that Hale genuinely came to respect and care about. Talk about his reservations, the way he tries to make-up for his mistakes. He wants justice, and he believes the courts will give justice. He accuses, and then he realizes he was wrong..... so he tells the people he misjudged from the beginning to lie in order to save themselves. Think about the guilt and responsibility that put on his shoulders.
Hope that helps.