I've been really taken with Michelle Schoenleber and Howard Berenbaum's paper on "Shame Regulation in Personality Pathology", and I'm developing a bit of a bias toward their 'solution'. But I am curious what other researchers make of the idea that dysfunctional shame processing in particular is a central or core problem for this population. What do you think (and why do you think it?)
Emotions influence executive function within cognitive processing. The influential environment and genetic aspects (familial) within an individual (diverse) can be a good short schizoid or borderline personality questionnaire if relating aggressive autonomic to defensive response aspects that include biological, neurological, and psychological, attributes to the overall health and quality of life in border line personality conflicts and disorder. Comorbidity is common on all fronts but this deals with treatment and of course intervention/prevention points that vary from state to state due to majority acclimations of unnatural acceptance to community laws, statues and morals. (Revolution 1776)...
That there is only one "key" component to a personality disorder is an unfortunate and erroneous path to go down. Personality disorder are the result of multiple developmental traumas across various domains - attachment, safety, neglect (clearly intertwined with attachment), and often more classical abuse. I suggest you look at the research on emdr and personality disorders.
I suspect in those cases where neglect and abuse occurred in childhood that the damage was complex. And I further suspect that the young mind struggled to make sense of the treatment they endured. I would think that the 'core problem' would relate more to the manners in which the person would try to cope and function over the coming years. What further and deeper damage occurs when the individual uses unhealthy ways to exist and avoid more pain?