This is the type of ragebait shit that reaffirms why I don't read the daily fail.
I think his punishment has been loss of liberty for the rest of his life. Which I think is apt given that his crimes were completely atrocious and I personally will never agree with the death penalty and am glad we don't have it here. I'm glad he will die in prison and is off our streets.
I think what you need to consider is actually prison management. This man may never walk the streets again, but there needs to be behaviour management strategies in place in prison to incentivise positive and compliant behaviour and reduce suicide attempts/riotous or violent behaviour in prisoners in order to support prison officers authority and most importantly to keep them safe (mentally and physically) in their jobs as well as managing staff retention in the prison system workforce.
I would ask serious questions about how good the "source" is at their job if they're a prison officer and don't see why its in their best interests.
The best gauge of how civilised a society is, is to look at how they treat the worst among them. Describing any prison as a mansion is deliberately provocative and misleading. Have you ever been inside a prison op? It's oppressive but unfortunately there will always be people like this guy who are completely unable to function safely in the real world independently and who need to be completely institutionalised to keep them and others safe for the rest of their life. It's unpalatable, but it's very easy to simply blame someone for awful things they've done, label them evil and wash your hands of them, but excluding true born psychopaths who had all their needs met in childhood (which are reasonably rare), the reality is that most serial killers are made and have been to some extent a victim themselves at some stage in their life. Doesn't excuse what they've done, but sometimes we're punishing someone who's been failed for never having been provided with the care and nurturing they should have been raised with in order to be safe in society. I personally don't think the death penalty or providing inadequate stimulation/food/ other provisions is ethical when you consider that aspect of it. So to me, long term loss of liberty and protection for the public knowing they are off the street is appropriate.
It also allows grace for people who have been wrongfully convicted which we know happens.