Do we maintain the abuse and continue to abuse others?

Hurt people, hurt people. So I’ve heard. I am not a psychologist nor a sociologist. I HAVE read quite extensively on Borderline Personality Behavior and Narcissistic Personality Disorder. I was diagnosed professionally as BPD 3 years ago. I’ve been BPD for all my life I believe. 


My question is, why do we continue to abuse others in various other ways that are clearly a reflection of our own Narc Abuse?