Yes well they were wrong. And you’re wrong that it could work just the same here.
You’re also wrong - but a bit less wrong - on the reasons for reoffending. It’s true that sometimes people are less afraid of prison after they’ve been there.
For some it’s the only structure they’ve ever had. But the riskiest time for suicide is after a recall, so it’s obvious lots of people are unhappy about being in prison.
Frequent reoffenders are also in addiction, homeless, mentally unwell or otherwise struggling. If you turn people loose with nothing to do and nowhere to go, it’s inevitable that some will come back.
People who’ve served long sentences and are accommodated in release because the law requires it, recognising that homelessness is a risk factor, offend far less frequently.
And the lowest reoffending in the world is in countries where prisons are miles better than English prisons. I assume you mean English, since UK would include Jersey which is surprisingly cosy.