That opinion include rapists and pedophile miss "womens Right"? Prison has 3 reasons to exist. 1, protect the public from dangerous people, and 2, which is second to 1 for a reason, Punish the offender enough so that he wont want to repeat his/her offense, and 3, rehabilitate the offender. 
The #1 goal is to defend society from those who do not wish to or are unable to abide by civilized rules. Ergo, it is counterproductive to just let them back into public without some measure of certainty that they wont repeat.