If we in humanity had OTHER methods of legal punishment BESIDES prisons and jails...
... no matter if criminals (ANY kind including the harsh typical ones) simply didn't "want" to go into either one due to inconvenience and selfish motives OR (albeit in THIS life, it doesn't you know, at least, in practice, call for reforms as such) they were afraid of worse fate than mere incarceration and lack of freedom ALONE, would there STILL in life exist cases where...
People either threatened or worse ended the life of someone in order to avoid such punishments? Or would nearly all criminals, no matter how stubborn or mentally gone or whatever at least not have a huge problem with that, similar to how kids or adults at school or work or at home may not have a HUGE problem with getting told off for doing something wrong or naughty?
Would criminals still have a "stinking GRASS" mentality in such cases? Even if all prisons or legal punishments had tolerable conditions in them both by rule AND nature?
Or would they actually gain an UNDERSTANDING of it all - and the whole typical advice of "if you do wrong of this kind, go to here in order to accept punishment" would de-facto work in a same or similar way as it would with people who are ill and need treatment?
And would someone for instance like Max Cady in either the 60s classic or the Martin Scorsese remake of "Cape Fear" THEN seen vengeance on their lawyer IF it all went according to legal and etc plan, and no inmates did anything wrong to him either - either because they didn't want to face further punishment OR they somehow couldn't bring themselves to do it and figured it wasn't at all worth it, as wrong as Mr Cady of course was before AND when he started to plan all those family revenge insane scenarios, which is obvious and I am not even debating it.
(But then, yeah, I know I know, with some crimes of course, and murder further so as it takes away someone's LIFE, there will always be that issue of victim suffering, family and society being affected and whatnot. And sadly in these cases, there is no machine or entity able to reverse such actions. So I can see WHY we have the NEED at least for the ULTIMATE legal punishment system that exists and operates the way it does, but still...)