I get so tired of the the two wrongs make a right argument. Not one Protestant claimed infallibility, nor would the majority of Baptists align themselves with the KKK. Unlike the average Roman Catholic, we admit the KKK is a vile sect of wrongdoers who should be punished for the crimes they commit. We want no part of them or their false doctrine.
No matter what non-catholics have done that does not support the church leaders right to be just like everyone else and still claim infallibility. It merely proves they are "just like everyone else" and therefore NOT infallibile. Otherwise, you are taking the words of a fallible murderer, or rapist or child molester (or ones who cover up such crimes for the "unity of the church") that they are infallible in spite of "what they do". It makes no logical sense and has no scriptural basis, especially in light of Matthew 28 when Jesus criticized the Pharisees for teaching "Do as I say, and not as I do."
Catholicism, however, continues to claim infallibility in spite of breaking the requirements laid out in the scriptures of how a leader in the church should conduct themself. No, they were never expected to be perfect, but they were expected not to be violent and to practice self control. Never did the Bible tell us that they were infallibile in doctrine no matter how vile their crimes.
As for the verse about casting the first stone, let us remember this was used against church leaders who wanted to stone a harlot when they themselves were adulterers at heart. Church leaders, unlike laymen, are to be "blameless." That excuse does not work with those who claim infallibility, even though Pope Sixtus III thought it was good one to use when he was put on trial for seducing a nun.
~Lorelei