If I understand you correctly, you want to know what purpose you think Mary Warren could serve. If this is the case, Danforth smells a rat, and he knows that Mary is probably the weakest of the girls. He hopes that she will serve up a confession, but unfortunately, Danforth...
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If I understand you correctly, you want to know what purpose you think Mary Warren could serve. If this is the case, Danforth smells a rat, and he knows that Mary is probably the weakest of the girls. He hopes that she will serve up a confession, but unfortunately, Danforth is not terribly strong. His understanding of the situation is purely legal; he does not have a clue about the underlying mob-like psychology that has swept through the ranks of the girls and through the town. He confronts truth and lies but doesn't have the will or the brainpower to make a distinction between either one. His solution is to simply give up.