I'm not sure how much of this particular issue makes it outside the US, but here we have public sex offender registries which are horribly inaccurate. There have been countless cases where people in a community have burned down an offender's house or beat them up, only to find out it was bad information.
Even if it weren't bad information, when you are released from prison, your debt to society has been paid. If it hasn't, then you should still be in prison.