"Well lets review the situation. Feel free to correct me or throw in anything else you have learned.
Some group of people, possibly lead by a Witch, is bringing magical addictive herbs into the town and using them to control the people of the town.
The mayor is either working with them voluntarily or is being controlled, but they control the government of the town, the guards, and an unknown number of citizens are willing to die to help them.
My church has been totally fooled by them, even after an investigation, and currently considers these people to be bandits, not fighters against this evil oppression."