I feel that every actions lead a consequences. I also agree people should not judge people based on the past. Let me draw a example. Suppose a person murdered and he was in prison for 5 years as punishment. I also believe the person deserve to live a normal life but I won't get close to the person to be friend but who actually knows if his thoughts actually changed or not.
So, even if I want those people live a good life, I don't want to give the second chance to them from my side as I can't afford to take the risk. Because we are humans we don't know if a person's thoughts changed or just pretending to be changed.