Seems like what "CPS would do" is the same logic described in the article itself, but instead of the perceived (but not statistical) risk to the children it's the perceived (but not statistical) risk to the parents of those children. I doubt (don't have real data) that reporting actually happens often at all, but it's so easy to imagine and potentially embarrassing and scary for a parent that they avoid it. So even if you don't buy into the perceived risk to your kids, you buy into the perceived risk to yourself.