Sorry I don't have links at my fingertips ready to go. It's human nature. If you allow a person back into society then he has the opportunity to live like everyone else. If you banish him, then he goes to the criminal subculture. If you treat him differently, then every strike against him is motivation to leave regular society.

You can say "we want him to reform" all day long. If you don't let him reintegrate, then good luck with that.