Fred West for Christmas

More reasons for me at least not to watch Sky News; apparently they broadcast a documentary about Fred and Rosemary West on Christmas Eve. As if brutal serial killers and rapists were festive stuff.
And how many TV documentaries have been made about the Wests? Are they finding new facts about them, even though Fred has been dead for twenty years and Rose is still alive and apparently enjoying herself in prison?
I don't understand the fascination with them. Besides, nobody seems to think about their victims and survivors.