Problem isn't with people who are in prison. Problem is with people who are out of prison with prison experience - most of them are thoroughly criminalised for life. So one should count people who served serious time behind bars, and now out - ideally, age-corrected, because people age out of crime and someone who got in jail at 18 and left at 50 is probably ok and isn't a big danger. That is the metric that society should strive to minimise.
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