Here’s my only point in all of this. To say, generally speaking, without any qualification, that “canonizations are infallible” is untrue. It’s dishonest because it leads the hearer to believe that canonizations have the same weight as dogmas. In the common estimation of man, infallible = dogma, absolute certainty, no questions asked. This is NOT the case for canonizations, which are not “of the faith” but only a “certain truth”.
Further, to classify canonizations as “common teachings” or “certain truths” is a minor stretch since these require unanimous agreement by theologians, which canonizations don’t have (but it’s close).
The denial of such truths without reason is considered “temerarious” or “reckless” but the in light of the canonization process changes post-V2 and the unprecedented situation in the Church, such a decision to withhold full assent is not reckless but prudent, (especially in light of the ongoing child-abuse scandals and it’s affect and tainting of JPII’s legacy...and the rumors of John XXIII’s freemasonic ties).
Truths that are certain, also known as common teachings (sententia communis) are truths unanimously held by theologians, derived from revealed truth, but by more than one step of reasoning: for instance, that God can create intellectual beings without ordering them to the Beatific Vision (cf. Pope Pius XII, Humani Generis paragraph 26). These teachings sometimes overlap with theologically certain teachings.
Denial of a truth that is certain is censured as temerarious.