The problem is two fold. 1. Murderers who served their time are not on a public murderer registry.
2. There are now (in PA) approximately 50 behaviors that get one on the registry that have nothing to do with child abuse. However, once one is on the registry that is the assumption made about everyone. Would you rather know your next door neighbor shot his neighbor six years ago or that ten years ago he had consensual sex with his underage girlfriend or looked at porn in his own home? The registry is cruel and unusual punishment and is meant to destroy lives.