I don't know. I grew up in a small town, pretty rural. A female relative recently told me of something that happened to in the mid-60s there. A man exposed himself to her (isolated country road) and drove off. She told her parents, and in no time, the police and the DA were on the scene. They never found the guy, but took it seriously. And let's face it, what happened to my relative is nothing compared to Jan's experience.
In the early 70s, my father was deeply disturbed by talk among the dads about a friend of mine and her step-father. My parents had felt uneasy about some things in that family for a while, but thought it was just them. It was mostly little things, nothing terribly obvious. Then my father realized other parents shared those questions. There were several children and teens in that blended family and their friends would visit, then come home with tidbits, which independently, meant little. Add them up and alarm bells sounded. Without going into detail, eventually we all found out the things going on in that family were awful. Even in a small town, many people in the 60s and 70s were capable of having a clue and weren't anywhere near so gullible as Jan's parents claimed to be. Sadly, just as in Jan's case, the mother of my friend was complicit. Yet to this day, her children love her and defend what I consider indefensible.
Through the years, I have learned that most children , even as adults, will excuse parental neglect/abuse. It seems to be a way of saying, "I know they did (or allowed) this terrible thing, but it wasn't really their fault because of XYZ. They loved me and did their best." It's all too common.