Since they go around to random people and try to convert them, they leave themselves open to what can happen. Different people have different positions on this. Personally, I expect their biggest fear is probably entering the house of a missionary of another religion who will succeed in converting them. They take their chances.
As long as they're not hurt physically, are not seriously abused, and are allowed to leave when they wish, I don't see a problem with whatever response they get.
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