If one claims they are speaking infallible truth then no argument contrary can be seriously considered nor examined with the possibility of a change of opinion. It follows therefore that objections to this so called “infallible truth” can only be error, sincere or not, no matter what evidence from any source, Catholic or not. Infallible is infallible!
From this flows the justification for any act for actions flow from belief. And the belief is that “the Church” is error free and that any errors were simply the result of fallible men being fallible men.
Forgotten is Jesus’ words to fallible men, ‘The kingdom will be taken from you and given to a nation producing its fruits’.
That is what can happen when men presume too much.