Oh comon. Are you kidding me?

Go ahead and support. That is what you are doing by driving the issue away from the fact that this person announced they are an abuser over and over.

You let one person who states he/she is an abuser onto PC and clearly has scared therapists and been involved in behaviors that are abusive, you minus well open the gates to all the "offenders" to talk about their issues here.

Good luck with that.
You think your discussions will feel safe? Will you enjoy reading what an "offender" did to someone else and how they now need support from PC because it was a hard session to discuss it.

That is what you will get.... go ahead. Open those doors.