Question

Bismarck disapproved of the doctrine of papal infallibility because is stated that the pope was free from error when speaking on matters of faith and morals

Answer 1

He disapproved of papal infallibility because this would mean more power to Pius IX. This can add up to the papal's international political influence and leadership. Papal political interventions have already been done in some events. It would give an exemption to the papal's mistakes that according to Catholics were sacred reasons. Furthermore, they consider the papal teachings are infallible.