I think it was something along the lines that therapists cannot ethically and effectively treat criminals. The have a duty to both the public to prevent crimes and the to client to maintian confidentiality. But if a therapist maintains confidentially, they criminal goes unpunished, and is free to commit more crimes against the public. If they report the criminal's acts, they lose the trust of the patient.
The question I think was something like a weaken type thing. The answer, as I saw it, was that the argument would be weakened if it were true that therapists could treat criminals, and maintain confidentiality, and through their private treatment, successfully discourage crimnals from committing more crimes.
This obviously isn't worded like the test, but this is as close as I remember it.