It was bad for Tradition, but it was good for the new-church-supporting-Indult communities.  The indult is not Traditional, no matter how you spin it.

They do not have to exercise fraternal charity in correcting the errors of their novus ordo brethren

Prove it. Your statement is false and the Indult is traditional because (1) it celebrates the TLM (2) it respects the hierarchy of the Roman Catholic Church and understands the need to work through it - just like the naysayers were falsely saying Roe v Wade, Trump's imperfections etc means you can't work through the system, you are mistaken here in saying that e.g. the false attempts in the 70s to "ban the TLM" were not rightly overturned by Summorum Pontificuм. And happily, the TLM has continued to flourish and spread like never before in these last 15+ years. All who truly love Tradition would rejoice, like Bishop Fellay did for e.g. when H.E. said: "I rejoice whenever a Traditional Latin Mass is celebrated".

One always has to exercise fraternal charity in correcting the errors of anyone, whether of oneself, of "novus ordo brethren", of sedes, of fellow indult trads, of non-Catholics, Prots, Orthos, non-Christians, Hindus, Muslims, atheists etc.

But Summorum Pontificuм itself wasn't an error. It was the correction of an injustice and allowed the TLM to spread.

Doubts? Lol. Let's say I doubt the Thuc Line's or CMRI and the sede orders. Will that be enough to make you "flee from the Thuc Line and CMRI". They tell you it is doubtful because they want you to believe it is doubtful so that indeed you will "flee from the dioceses/indult" and not to want help work toward the greater freedoms of all Priests to offer the TLM, like for e.g. Archbishop Lefebvre often worked, even from the 70s and 80s.

Just one point should be enough to settle a real doubt and help arrive at certainty - well docuмented Eucharistic miracles that have converted even atheistic scientists to Catholic Christianity https://www.tumblarhouse.com/blogs/news/recent-eucharistic-miracles-science They had doubts about Christianity itself, then resolved those doubts and became Catholics. "Doubts" are not good, and they are to be settled by miracles or by authority.

"6 Incredible Eucharistic Miracles That Happened Recently". SSPX has a detailed study that independently arrives at the same theological conclusion. That's why they now work with Indult and diocesan priests more extensively. Over the last 2 decades or so, the Society's priests read and mostly accepted the Indult arguments for their validity and why canonical recognition is at least beneficial. Today, SSPX and FSSP priests mostly hold the same theology. Since the SSPX and FSSP represent something like 80-90% of Tradition, it's safe to say most Traditional Priests today hold to Indult theology and/or accept that sacraments in the Indult Churches are valid and licit.

The fact is, of the 400,000+ Priests in the universal Church, only maybe about 10% or less so far offer and know to offer the TLM. The goal should be, and this is where the naysaying sedes and other defeatists lose the ball completely with their shortsightedness just like on the abortion issue, for Traditional Priests to help train as many of these Priests as possible - as SSPX and FSSP Priests are admirably doing in many places - to offer TLMs in their Parish.

Your choice, but ok. The TLM did not regain its rights in 2007 because of running away, either from Rome or from others. It regained its rights, because of Pope Benedict XVI's good dispositions, but also because Archbishop Lefebvre and Bishop Fellay kept persistently asking for it, and thus delivered this great victory for Tradition.

I'll wait until Rome reconverts to Catholicsm before having anything to do them. If you were in my parish, I would minimise all contact with you and advise my children to do the same with your children.

I can't recall being condescending to you, just explaining what I believe and why; but you seem to be being very condescending to me in doing the same, explaining what you believe and why. But sure, let's see what Archbishop Lefebvre said:

+Lefebvre: "I THINK THAT, like all traditionalist Catholics, you would like now to hear how things stand; at what point relations are between the Priestly Society of St. Pius X and the Vatican in Rome. So I shall give you a rapid summary.

Why do I maintain relations with Rome? Why do I keep going to Rome? Because I think that Rome is the center of Catholicism, because I think that there cannot be any Catholic Church without Rome. Consequently, if our purpose is to find a way of setting the Church straight again, it is by turning to Rome that maybe, with the grace of God, we may perhaps manage to set the situation straight. It is not one single bishop like myself who can set the whole situation straight in the Catholic Church. That is why I strive to keep on going to Rome and to plead the cause of Tradition."

From: https://www.sspxasia.com/Docuмents/Archbishop-Lefebvre/Conference_at_Long_Island.htm

So much for "staying away from Rome" at all costs. Take care not to fall into a practically sedevacantist ecclesiology. Wish you the best.