They have a better quality of life than low-income US citizen. Except for, you know, not being able to leave.
Here’s an article about one of those prisons on an island: https://www.forbes.com/sites/davidnikel/2020/07/01/basty-norways-island-prison-where-inmates-work-ski-and-watch-tv/
The prosecutor at the Nuremberg trials famously defined “evil” as the absence of empathy. His point still stands.