In my perception, most abusers have multiple victims, so there can be a lot of victims on account of a smaller number of abusers. Also, abusers tend to be grouped together socially, as they are drawn to others who will approve (and only abusers approve of abusers), as well as because families can be affected generationally to the point that a large percentage of a family tree is abusers. In many cases of child abuse (of all kinds) there are telltale signs that people ignore, and once people ignore something like that, they become guilty in their own right and are more likely to sympathize with and thus become abusers, themselves, with the starting point of saving their own hides and not wanting to face their own guilt. For all of these reasons combined, if someone is victimized by an abuser, it is very likely that they grew up around multiple abusers and many other victims.