“Just out of curiousity, why would Protestants care whether a man they believe is a fraud (that would include ALL popes) thinks someone else might be a fraud?”
Because they are insecure in their 10,000 interpretations of the Bible, and their 10,000 denominations and their 1,000,000 splits and schisms. Notice the systemic policy of the Presbyterians to allow clergy to not even be gay but now have gay sex outwardly. Soon, there will be about 100 churches in that split that keep God’s law.
Quite true. They really have no idea what they believe and they are faced with the inconvenient FACT that if “sola scriptura” was legitimate ALL Protestants would be Lutherans. Their theology is based on the inane assumption that the Holy Spirit correctly allows their own sect to interpret Scripture while tricking each of the other thousands of sects.
The very thought that God would deliberately be truthful to one group while lying to thousands of others is so unbelievably cruel that only a masochist would subscribe to it.