You thought the doctrine of Papal Infallibility was conceived in ignorance of the Paul’s correction Peter? A pope’s pronouncements are only infallible upon meeting highly stringent requirements. Look it up. Most popes never exercise their power of infallibility.
No, I understand what the Roman Catholic Church means by the term, but, in light of the authority enumerated and implied by saying someone is the "Vicar of Christ" and his representative on earth, obedience is demanded regardless of "highly stringent requirements" of ex-cathedra pronouncements. Just like the statements I quoted later where even if the Pope was Satan himself, a faithful Catholic should obey him. Don't you agree that is taking the idea a bit too far?