This is not specific to Paganism. As has been noted before, communities outside the mainstream tend to have more people with a history of abuse, because abuse often drives people away from the mainstream. Pagan communities reflect this reality, so discussions of abuse tend to be particularly relevant to us, even if they don’t specifically address the experience of being a Pagan abuse survivor.
I originally worked this out in 2010, talking with friends and going over our respective histories of personal abuse. I made a post to my LiveJournal at the time, with the initial version of this outline. This isn’t an academic theory with research and studies backing it up, it’s just my personal observations worked out over years of being and interacting with survivors of personal abuse.