You are misrepresenting the comments on the other thread.
The issue on the that thread was:
the OP’s father was convicted of similar crimes
the OP wanted to continue playing happy families with their father (like his siblings and mother were)
their wife wanted nothing to do with them (her FIL) and it was causing difficulties in their marriage.
It also sounded like OP had primary aged children.
The overwhelming majority of posters said that they would have nothing to with anyone in their family who was involved in child sexual abuse. Pretty much what @Over40Overdating said in response to your post on this thread:
And if/when his children start to become parents themselves the questions will start again and they’ll see him in an even worse light. How could you ever let a man who spent months chatting to a convicted paedophile and didn’t report those images of children, anywhere near your own children
That is why the OP on that thread (and probably you also)was eviscerated. NOT because anyone thought the wife and children of the abuser were not victims.
H.E’s family must be in turmoil and feel a huge amount of shame.
They have nowhere to hide - their families, neighbours, friends, colleagues, those at the school gate etc will know what their father, husband, brother, cousin has done. It will be so hard for them to come to terms with this and move on.
However, I will rapidly lose sympathy if this is something they were aware of and didn’t report it or they stand by H.E.