I think to many people that come from broken homes ( in my case my H)don't really know how (b/c they didn't see) to work on M/R's. What they saw was the two people they trusted the most giving up, and guess what they've decided to teach their kids. I don't know that it really matters if it's MLC or a coping mechanism, they're still "broken". The question is how badly do they want to fix themselves.
