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From what I've learned, all BPD's exhibit the exact same behaviors, but to more or lesser degrees. IMO, that gives more credence to the genetic factor.
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I disagree. The fact that these are called "personality" disorders suggests/identifies them as developmental in nature. It can run in families because one who experiences the world with the difficulties of BPD passes on those coping "skills", methods, perceptions, ways of being.
That the behaviors are similar (I disagree with 'exact same') because the same dysfunction of attachment has been experienced, so the same dysfunction of development evolved for survival.