I wish it were that simple and clear-cut, Moosetracks. But just because we may want it to be that way doesn't necessarily mean that it is. The world is not so neatly divided into "us and them" because we are all human and all capable of causing harm. There is a little bit of "us" in "them" and a little bit of "them" in "us" whether we care to acknowledge it or not.
And people are known to lie on intake forms. T's are known to make mistakes when they rely on feelings to spot survivors or offenders. And yes, I would prefer that my T continued to treat someone who revealed that he or she was an offender, because referring him or her out does not guarantee further treatment, and unless the patient's previous victim(s) come forward and accuse him, or he is currently a threat to a specific person, the T cannot legally divulge this information to anyone else, including another T, without permission. If my T continued to treat him, at least there would be one less untreated offender on the streets.