The Pope is alleged to be infallible yet he is a human being. The only infallible human being to ever grace the face of the earth was Jesus Christ. So much for the Pope’s infallibility. It appears that he erred, and in a way that was detrimental to the safety of children who were taught to trust their priests and other religious leaders. This scandal is a Catholic matter and it is up to Catholics to decide what they must do about it.
You need to understand what the doctrine of infallibility is and what it means. You are in error in the way that you are using the doctrine as applied to your logic.
Papal infallibility applies only to the Pope’s thoughts on doctrinal issues. Only a tiny number of the writings of the Pope(s) are ever considered to be infallible.