According to Dimondites, St Thomas Aquinas is wrong, the catechism of the council of Trent is wrong, people who taught baptism of desire for centuries are wrong...
But the nail in the coffin for me is that they keep predicting the end of the world, and I do not think the end of the world is coming any soon.
Totalist sedevacantists think the apocalypse is soon. Instead, I think sedeprivationism has more credibility, and it also offers a possible solution to the problem at hand.
Doing nothing and waiting for God to sort it out will not work. I think God wants us to act, not merely passively react. The state of the West is extremely worrying, and I cannot fathom how true Catholics let the events of Vatican II happen without... Going berserk and killing the fakes.
Maybe the last valid Pope is the one that was αssαssιnαtҽd by the mafia.