Maybe the questions should be: If someone is convicted of child molestations should he/she ever be allowed out of prison? Likewise, I don't believe anyone convicted of 1st degree murder should ever get out. After legitimate and fairly quick appellate process a conviction of 1st degree murder should result in the death penalty.
You can ask that about any crime. That's not the question here. The question is when should a convicted criminal get a clean slate back? If an armed robber should get his rights back once he's out of jail then why not other criminals as well?