I think one thing Catholics should understand about the SSPX–Vatican situation is that the world has changed.
Long before Vatican II, Popes were already warning about secularism, liberalism, and modernism. The shift away from Christian civilization was already happening.
Now, by the time Vatican II arrived, many nations that were once-Catholic - like France, Spain, Portugal, and Ireland - were already deeply secular in public life. The old "Catholic state" structure was already collapsing.
Therefore I strongly believe Vatican II did not create a new world. Rather, it responded to a world that had already changed.
I think this is the key point people miss.
Yes, evil has no rights. That declaration remains true. But Vatican II was not saying error becomes truth or that all religions are equal. V2 was addressing a different question: in a modern state, can people be coerced in matters of religion?
That question matters, because we are no longer in medieval Christendom.
Therefore, when some SSPX apologists act like Vatican I–era structures can simply be restored everywhere today, they are ignoring reality.
I think we should be more focused on how the Church stays faithful to her mission, doing the work of our Divine Lord, Jesus Christ, in a world that no longer looks like Christendom.