Imagine just sitting there thinking each time you hear those footsteps. In the regular prison system at large Amnesty International has repeatedly singled out Japan for various abuses that verge on torture. A quick search for "keiheikin" can send you on a web crawl about such. Yet of course the criminality rate in Japan (and many places in Asia for that matter) is near zero, in spite of a vigorously punishment/revenge based system.
The point I make with this is that different places have different populations with different proclivities. It's not like if the Norwegian system was adopted in America we ought expect to suddenly see a relatively crimeless population with negligible recidivism rates, anymore than if Norway adopted the American system would they suddenly expect to see sharp increases in violent crime and skyrocketing recidivism rates.
> widespread rehabilitation is impossible
Ah come on, that assumption is easily disproved by looking a bit around and elsewhere.