Absolutely not. Since they can’t be cured or psychologically changed, group therapy only teaches them how to pass more successfully. It teaches them to become even more skillful wolves among the sheep.
Further, any therapist who believes they should is not actually a therapist at all, and should, in my opinion, lose their license. Therapy only works through the therapist witnessing for the client’s unconscious (or soul or psyche) the client’s soul wounds. The client may divulge to the therapist soul truths they can’t divulge to themselves, as the client journeys to reintegrate the alienated self. Basically this is the Alice Miller methodology. But it was ever thus, she is just one of the few to try to write it down. The only therapists who are useful are the ones who’s subconscious can sense the needs of their clients’ subconscious and mirror them. If the soul defect of the sociopath/psychopath is not apparent to the therapist, that person is a therapist in name only.
Being psychopaths, the normal psychopathic shenanigans will take place in the group. Extremely manipulative the psychopath may essentially take over the group process without the enabling therapist’s even being aware of what is happening. Or the psychopath may be driven by arrogance to prove his superiority over and over again. There’s a well-known story of a psychopathic client bragging to the group of seducing both the therapist’s wife and girlfriend, all the while with the therapist sitting there attempting to keep his best therapist face on. To put it bluntly, any therapist who allows a psychopath in group therapy with non-psychopaths is stupid and/or incompetent.