My grandfather molested my mother for many years of her childhood. He went to prison and did his court ordered therapy. The family believes he has changed, My aunts and uncles even let my cousins stay at my grandparents when they were little. And now that I have children of my own I cringe at the thought of him holding them let alone letting my helpless children stay for overnights. Do you believe child molesters can change? Would you ever trust one?
Do I believe they can change? Maybe. BUT I would never trust my child with one. Imo, part of changing is knowing you can't trust yourself to not be tempted so you simply don't put yourself in that situation-i.e. having young children with you alone.