Unlike the ordination of a Deacon, Priest, or Bishop the crowning of a Pope is not considered a sacrament. If the pope wasn’t infallible before he became pope what makes him suddenly become infallible after he becomes pope?
What changes?
I’m just really repeating what everyone else is saying, but perhaps this may help, as well:
The Pope is not infallible. It is the Magisterium that is infallible, the Magisterium being defined as the “teaching authority of God.”
All the bishops, including the Pope, shares in this infallibility by virtue of their office, which they received through the Sacrament of Orders. The Church has defined the occasions when the Church has more certitude when this infallibility is exercised than in other occasions.
In short, the infallibility of the Pope is no different from the infallibility of the Church, the infallibility of the Ecumenical Council, or the infallibility of the body of bishops.
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