hispeed, guilting an MLCer. I have wondered about that as a tactic, as a way to facilitate their transition to rock bottom. I think it is best to not involve yourself in any guilt trips. Leave them to their own actions, karma, divine intervention, a higher power, or whatever - but we stay out of it.
If they want to talk about or discuss topics that are guilty, shameful, etc... proceed with caution. You do not want to be blamed for them feeling bad.
When they get to a place or time when guilt or remorse can start working on them, the MLCer has more than enough bouncing around in their head to cause overwhelming guilt. Us adding more guilt is like adding gas to an out of control fire; they are already struggling far too much trying to get their feeling under control.
I would say patience is the tactic to employe. Go slow and at their pace, the journey out of their tunnel is a long one, and they need to lead the way.
Stay strong. Stay patient.
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.