Explain the dramatic irony when Parris says, "I know that you -- you least of all, Thomas, would ever wish so disatrous a charge laid upon me."

Thomas, of course, is Thomas Putnam who is only interested in what can benefit himself. Putnam is not a happy man when Parris is chosen to be the preacher because he had a candidate of his own he wanted installed as preacher. Had something been charged against Parris, Putnam would have felt himself vindicated, so he would very much have liked to see Parris charged.