But you guys DO REALIZE, of course, that the Catholic Church has no official teaching about what happens when a Pope falls into heresy. Right?
All the St. Robert Bellarmine quotes in the world won't make it a dogma or official teaching of the Church. His opinion on whether the Pope could fall into heresy, and what would happen if a pope DID theoretically fall into heresy, was just his personal opinion, nothing more. Other theologians -- his equals, I must point out -- disagreed with him. St. Robert Bellarmine wasn't some kind of universal, eternal mega-pope whose opinion gets precedence over all others.
Why are we still discussing the pros and cons of sedevacantism in 2017, when this Crisis has been going on since the 1960's?
Either concrete proof, dogma, doctrine has been impossible to find, or there are a LOT of
A) ignorant, uneducated, dull of mind, and/or
B) sellout, compromisers, wanting ease, human respect and unwilling to fight, and/or
C) malicious sinners who don't want to be Catholic
people out there. Just look at all the Traditional Catholics even (who see the problems) who fail to become Sedevacantist. They look at the arguments and they say, "Meh. I'll pass."
Now there are some sedevacantists -- the dogmatic kind -- who think sedevacantism itself is a dogma of the Catholic Faith: if you deny it, you aren't Catholic. This sort of sedevacantist isn't allowed on CathInfo, because they believe that every non-sedevacantist fits into category A, B, or C (above) -- or even more than one category. This is simply not true, and CathInfo is a message board for the truth and those trying to seek, share and expose the truth.
If Sedevacantism had a silver bullet, a conclusive proof or argument, it would have prevailed by now.
My conclusion is that the Catholic Church HAS nothing "on the books" for a situation like the Vatican II Crisis in the Church. My conclusion is that the Crisis is a mystery, which can't be reduced to any simple explanation.
The Church does provide justification for the Traditional Catholic movement, but it doesn't explain away every facet of the Crisis, and it certainly doesn't insist on Sedevacantism. It takes care of our souls, while leaving us shrouded in mystery.
If the Crisis could be reduced to a simple explanation, there would only be one true solution, and all the others would be IN ERROR, just like protestants and other non-Catholics.