1) Stubborn's errors- "Once a Catholic Always a Catholic"
2) Stubborn's errors- The Magisterium can err and be evil.
3) Stubborn's errors- We only need to be subject to the Roman Pontiff when he is defining Dogma.
1) Any Catholic who ended up apostatizing or became a heretic can receive the sacrament of penance whereby the censure of excommunication is removed and the sin is forgiven. One who is not Catholic cannot receive the sacraments. This Catholic teaching is all you need to accept. This is how we understand once a Catholic always a Catholic.
Yes, there are times when by an official papal decree, only the pope or bishop can remove the censure - yet even under those circuмstances, if the heretic is in danger of death, that heretic can have any priest absolve him in the sacrament of penance or extreme unction. Again, one who is not Catholic cannot receive the sacraments.
But whatever the circuмstance, no one has sentenced any pope with the censure of excommunication for heresy or any other sin - and YOU saying heretics are not Catholics is like doing a rain dance for rain - it means nothing, absolutely nothing to everyone.
2) The Hierarchy can, has and continues to err - and from my perspective, every single one of them are evil. But you're using "the magisterium" in a context which makes no sense.
"The Magisterium" is nothing other than the Church teaching us, that is what the Church does. The Church was established by Christ to teach us how to get to heaven. So you need to replace "The Magisterium" with "The Hierarchy", then it's not only true, it actually makes sense when you say that I say: "The Hierarchy can err and be evil."
3) We need to be subject to the pope and obey him as the pope in all those religious matters under his authority always - UNLESS he should command something which is sinful. Pax Vobis spells it right out in plain English.........
One must be subject to the Pope in all things, save sin. The novelties of V2 are not catholic, therefore they are rejected. V2 does not follow the universal magisterium, therefore it's rejected. V2 does not deal with dogma, or infallibility, or church law. It never claimed to. Anyone that follows the church leaders into error does so at their own volition. No one in Rome is forcing them into error.