Not that I'm advocating the death penalty, but did abolitionists take into account a prisoner's mental state incarcerated without hope all these years..
What used to happen was, prisoners with life without parole were never told they had life without parole and would get bogus parole hearing's in the view that it would benefit their mental health (false hope)
However the EU human rights legislations put an end to this, I don't think Jeremy was ever "upgraded" to life without parole I think he was more or less told the truth about his sentence if you know what I mean