I like the Japanese method - lock ‘em in a cell all day with just a little plaque listing their crimes and how long they have to serve; no human contact; no reading material; limited or no personal possesions.
Only let them out for food, baths, etc., which have to be taken quietly, or even silently.
Combine this with a high-carbohydrate/low-protein diet and you should have relatively docile prisoners who don’t EVER want to go back to prison again.
My own addition would be a fixture in the ceiling which would be perfect for tying off a sheet...
You said — “I like the Japanese method - lock ‘em in a cell all day with just a little plaque listing their crimes and how long they have to serve; no human contact; no reading material; limited or no personal possesions.”
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That sounds like the super-max prisons and/or the facilities like that, we have within general prisons...