In your quotation Pope St John Paul II says that the 'structures of sin' not ( structural or institutional sin) " ... "are rooted in personal sin and always linked to the concrete acts of individuals ...", this bears out what I said that institutions, organisations and the like cannot be held accountable at the Last Judgement, only individuals; corporate responsibility will not be judged before the throne of God.
Each one of us will stand alone at the Last Tribunal where we will be required to account for our deeds in this world and there will be no advocate for us as God knows our very minds.
If you think structural sin exists, how do you think these 'structural sinners' will be judged? Several people arraigned in the dock before the Throne of God, whole institutions, the whole Catholic Church, the whole of Creation?
No, each of us will be judged upon our own behaviour and will not be able to plead, "I was only obeying orders from above when I knew they were wrong."