It appears that historical facts and logic do not fare well when inserted into a bag that contains mostly hammers.
Apt description of argument by assertion, based on the the novel and unScriptural premise of ensured perpetual magisterial infallibility as per Rome. For Rome has presumed to infallibly declare she is and will be perpetually infallible whenever she speaks in accordance with her infallibly defined (scope and subject-based) formula, which renders her declaration that she is infallible, to be infallible, as well as all else she accordingly declares.