You are incorrect, quite frankly:
Then on the Council’s key text Gaudium et Spes, Cardinal Ratzinger describes it as a Counter-Syllabus, in other words the opposite of the Catholic Church’s authoritative Syllabus of 1864. *
The Cardinal writes (Principles of Catholic Theology [Téqui, 1982], p.42ó),
**
If we seek an over-all analysis of Gaudium et Spes, we could say that it is (linked with the texts on religious liberty and on world religions), a revision of Pius IX’s Syllabus, a sort of Counter-Syllabus… Let us recognize here and now that Gaudium et Spes plays the part of a Counter-Syllabus insofar as it represents an attempt to officially reconcile the Church with the modern world as emerging since the French Revolution of 1789.
*
from:
ireland.sspx.net/bishop%20fellay%20letters/Fellay62.htm
and further documentation:
traditioninaction.org/ProgressivistDoc/A_031_RatzingerCouterSyllabus.htm
If you want to simply say I am wrong and just repeat what you already posted, I have already acknowledged that as your position. I’ve also read the SSPX arguments and they are lacking. They read everything with the hermeneutic of suspicion, attempting to see it in the worst light possible–that is completely at odds with the modus of the saints.
Likewise, their view of traditional Church teaching and praxis on this matter seems very limited to about 3 centuries. And I sympathize with them because many, especially the French, in those centuries were hurt by the revolution in civil government and life that took place and they found comfort in the faith during those times. But it is not true that everything must be done exactly as it was in those centuries or else it is heretical.
In the 19th century we see the final attempts to hold what vestiges of that past order together. Sadly, it was not successful. But the Church is not so linked to the state that when the state fails, so does the Church. Rather, she must again make her presence known and re-evangelize that sector. Condemning or even commanding people who don’t respect your authority in the first place bears no fruit–just try it some time. The Church cannot simply isolate herself, but must reach out to a world of poor sinners. And anyone with any experience in the field of evanglization knows this is not done through harsh condemnation. Harsh condemnation is for those who know (or should know) better.
This is why St. Paul in Acts first pointed out what was good in the culture he sought to transfigure. He showed well why what was good was good, why what was evil was evil, and then how the Catholic faith was the fulfillment of what was good (and how it was what every human hear and soul was in need of). He also reasoned for great lengths of time.
It is vain to use an approach geared for one set of circumstances when another exists. When the state is essentially all members of the Church, a certain approach may be best, but when the state is not, a different one is necessary. That is the point Ratzinger was making. The situation the Church was in had changed radically. That doesn’t mean the principles the Syllabus is based on were over turned (that truth is objective, that there is one true religion, that the state has the obligation to govern itself according to truth, etc.) Gaudium et Spes (and the current Holy Father) both affirm that the Catholic faith is an essential element of the common good of all nations.
The problems of today are due to the faithful not taking that approach, but becoming more indifferent and turned in on themselves. But such is how it has always been, it is our sins and self-love that hinder the mission–but praise God, He is mightier than our sin!