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Let me qualify that: every single case I have personally encountered, which is on the order of a dozen, can be traced to trauma. I’m making an educated guess about the wider prevalence. Getting societal scale data is practically impossible for many reasons including privacy. However, for those looking for some data points, I’m sure Gabor Mate’s book mentioned in the original article is full of examples. The most convincing academic references I am aware of at this time is are Dr. Bessel van der Kolk (“The Body Keeps the Score”, focused on PTSD) and Christine Courtois’s books including “Treatment of Complex Trauma“ and “Healing the Incest Wound”, both of which cite a large amount of research literature.