All this “he got out of his sentence” and “I wish he’d been alive to continue to suffer” sentiment is understandable but misplaced.
I used to (within the last 6 years) work in a notorious men’s prison. I won’t say the name here, but it’s one you’ll have heard of.
The protection prisoners (paedophiles, rapists, grasses) are all lumped together but they are completely separate from your everyday criminal. They never, ever come into any sort of contact - ever. The protection blocks are quiet (expected as a fair portion of the punters are convicted of historic crimes and are now in their 70s), very little trouble, almost non-existent violence. They get everything a standard prisoner gets, just lots more protection and no expectation of work etc.
There’s no suffering, they’re socialising with people of the same ilk as them. They’re all pals, speak to each other like friends in a pub would.
Unfortunately, you’re kidding yourself if you think they are in some hellish nightmare. They’re not.