It has occurred to me that the word "choice" may be a problem depending on where you sit. For me, if my mlcer knows right from wrong, and he chose do behave and leave as he did, that it imo a problem with HIM. For some if their MLCER knows right from wrong and chose to behave and leave in the manner they did, it makes the LBS feel like it was their own fault, like they were lacking. For some, if it isn't the MLCers "fault", as in "they had no choice", then they can justify still wanting them back, not realizing that none of us has to justify anything. I've always said, I don't like who my mlcer is now. It doesn't mean I might not like who he ends up. I don't have to justify how I feel or my opinon to anyone. Nor would I be offended if someone disagreed with me.
MLCers do what they do. They make choices, ill informed by a screwed up brain or not. Those choices sometimes have devastating effects on those around them. Why they do it might make a difference for some, but getting stuck in their "whys" does not necessarily help. And I mean stuck, not just learning.
Of course maybe someone here will write a paper and get a ball rolling on research of MLC. You never know..