IMO, the Dickies are far from being mice, they are incredibly strong and courageous.
This case belongs to the police who have been extremely careful in everything they've said for a reason. Even when they were still calling Allison a missing person, to their own admission, on the day she was found, they said they had been treating it as a murder case for some time. So they were telling the media one thing, for a reason.
The Dickies are unable to make any accusations, even if they wanted to. But I do think that if you read between the lines, it is clear how they feel and they do it in a dignified way, which respects Allison and the children. Remember, he is the children's father. To call GBC vile names does them no service.
Also, I don't think the Dickies are haters, I'd imagine them to feel great pity and sadness toward the person capable of doing such a thing. I'm sure they must be so angry, but they wouldn't waste their time on someone who deserves pity rather than hate.