Very dated way of thinking. You might want to read up on the Norwegian model https://www.businessinsider.com/why-norways-prison-system-is-so-successful-2014-12?r=US&IR=T
Can I split hairs on this one? In terms of rehabilitation of SOME criminals this really does work. However evidence suggests that for criminals convicted of the more extreme crimes it makes no difference in the vast majority of cases.
The Norwegian guy convicted of the mass killings of students on whatever island has an apartment that also includes a personal gym area. He’s never coming out... what’s the point in attempting rehabilitation? Without a doubt a very humane way to live but shouldn’t the punishment go some way to reflect the crime?
I’d argue that the UK’s version is poor but also the Norway’s version goes too far the other way.