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John of St. Thomas, Cajetan, Suarez, Billot, Billuart, Torquemada, Vittoria, and many other fine theologians opined that a heretic remains pope until such time as the Church declares God has deposed him.

Against these, the sedevacantists hold to a contested interpretation of St. Bellarmine.

Fine and well.

But let’s not pretend the R&R position is irrational or untenable, when theologians as great as those mentioned above held the same position.

You are correct. But I would like to point out that the sede interpretation of Bellarmine is actually incorrect. Bellarmine argues R&R - He said a heretical pope should be "resisted" and "who will depose him since he is a sovereign?" and "an ecuмenical council cannot even do it". If you don't believe me, then go read the pertinent chapters of "On the Roman Pontiff"

Yet here we have laymen who will depose him, and uncharitably attack those who actually hold the position of the Saint they claim as their own. Others take it even further and make it a new dogma that you must hold and even change the canon of the Mass. How isn't that the slyest manifestation of Modernism in existence?

All this over what? As has already been pointed out ad nauseam - there isn't a practical difference between the R&R and sede approaches to the crisis. R&R already knows that Rome has lost the Faith. They already operate outside the Conciliar Church. Maybe the sedes should go bark at the local Novus Ordo church, or FSSP if they want to evangelize. But I have a feeling evangelization isn't what this is really about...

The latest from Antipope Frankie:

https://www.americamagazine.org/faith/2022/02/02/pope-francis-audience-communion-saints-242321

Wow.  I don't know what this guy believes, but he clearly doesn't have the Catholic faith.

All this over what? As has already been pointed out ad nauseam - there isn't a practical difference between the R&R and sede approaches to the crisis. R&R already knows that Rome has lost the Faith. They already operate outside the Conciliar Church. Maybe the sedes should go bark at the local Novus Ordo church, or FSSP if they want to evangelize. But I have a feeling evangelization isn't what this is really about...

It's about intellectual pride; about being right more than anything. And this isn't just found on one side either, it's present on both. Which is why we can't agree to disagree until the restored Church settles the matter.

And I hold to a sede vacante position myself, mind you (more or less closer to Cassiciacuм or Fr. Chazal's position).