It might help you think of it in terms of opportunity.
Very sadly, your DDs abuser saw or created an opportunity and took it.
Do you think that if he hadn’t had a daughter who befriended a girl(s?) to provide him with the opportunity that he wouldn’t be an abuser?
Or might he have had to create a different opportunity? Maybe running a club for young children (like Scouts) or a sports club (football seems to have attracted some terrible abusers)?
Abusers rely on things like plausible deniability (as well as other things like coercion and blackmail etc) which in many cases is successful. Just look at the gymnastics coaches who were abusing girls for years and everyone ignoring the girls speaking out. Jimmy Saville for that matter - he groomed a huge network of people to turn a blind eye and silence victims to protect him.
Many abusers aim for longevity in their offending so creating protection for their offending takes time and dedication. If they just grabbed a child off the street and used a nearby alleyway, they might be successful that time but then cctv/police/courts etc would put a stop to their offending pretty quickly. An abuser football coach on the other hand carefully grooms parents and children alike.
If a man is no good at football, someone else is running the Scout groups and he doesn’t have a daughter to provide potential victims, he now has another option. One that exempts him from all normal safeguarding a man is subjected to and raises him above all suspicion with anyone concerned about his behaviour silenced and removed. He can identify as trans and involve himself in a girls swimming team (or enrol on a beauty therapy course where girls strip were coerced into stripping almost naked in front of him like Adam Graham did).
He gets to wander round the girls changing rooms to his hearts content and as an added bonus can get the receptionist who tried to prevent him using the ladies changing rooms disciplined.
If a man was an abuser, gender ideology hands him opportunities on a plate. The swimming scenario is happening in real life btw. Several different men in various countries have cottoned onto this.