It's absolutely impossible for prison to morally absolve prisoners: most do not enter there willingly (i.e., they plead not guilty) and their entire freedom to do anything, much less make amends, is stripped away. Rehabilitation does nothing for the flesh and blood victim they're in there for hurting.
> most do not enter there willingly (i.e., they plead not guilty)
The idea that most incarcerated people pled not guilty, were tried and found guilty, and are now incarcerated is not true in the US.
Many of incarcerated are still awaiting trial. The DOJ reports that a quarter of those in US jail and prison are awaiting trial [1]. I suspect most of those cannot afford bail.
In terms of after trial, npr reports, "98% of criminal cases in the federal courts end with a plea bargain" [2].
