I think denial of childhood sexual abuse, and also family dysfunction is one of the reasons we cannot eradicate it completely.
This is absolutely an issue about child boundaries.
These kids (10 and above) are learning they are not entitled to any personal privacy, the younger sibling and older are in a vulnerable situation.
There are literally libraries full of books about this.
No excuse exept you find the truth unpalatable.
How about the kids - we ought to protect them, however distasteful we find the topic, surely? And can we also agree that you did not have to join in this thread if you only wanted to put down an opinion, rather than just state your own.
If you met the adult version of these abuses - would you insist they never speak on it too?