You're making the huge and incorrect assumption that all crimes are something that one can be rehabilitated from. In some cases, people's brains are just too messed up to be a functioning part of society. That's not a failure of the state, it's a "failure" of the human genome. Is pedophilia one of these crimes? According to Dr. Ho writing in the British Medical Journal, and many others, it's not something people actually get over. I'm just saying it's far more complicated than "a failure of the system."
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Not for the rest of us...
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Our prison numbers are far more about drug laws and privatized prisons than they are about rehab versus vengeance.