I don't understand why you equate having "baggage" with being "responsible" for it. GV explained the different quite well.
It's like a stain or a taint on the orgazation. Very often Rome would evaluate the virtues of a congregation's or religious order's founder before giving approbation to it.
You're the one claiming the organization has a stain. I am asking why it has one, and I haven't heard a real answer yet.
They should have dissolved the original CMRI, tweaked the name, and formed a new organization.
And what would that change, exactly? Same people, same rule, just different name? That would make a huge difference? You're saying they should have gone through some legal fiction of changing their name, and that would have made a huge change in the organization. I don't see why. Changing the name of an organization is just a legal fiction, and their name was beautiful to begin with, since it was the name of Mary.
Religious Congregations typically take pride in their founder and take their spirit from their founder.
Evidently the CMRI doesn't, though, since they drove their founder out.
I know several SV priests (one now a bishop) who didn't want to get involved with CMRI due to this tainted history, despite considering the Thuc line valid.
You are being a little naive here. Their motive is one of competition and clerical politics, not one of principle.
Father Ripperger speaks of "generational (evil) spirits" that can stay with family line, and the abhorrent sins of Shuckhardt probably still haunt the CMRI. They need to make a clean break from that guy.
They have already, by driving him out and suing him to gain legal control of the properties. Schuckhardt died forgotten, alone and disgraced, with a couple of fanatical adherents who followed him despite his rejection by the community, while the rest of the CMRI went on to cleanse their organization and has gone from strength to strength ever since. And by the way, Fr. Ripperger is first of all not a valid priest, and secondly he is a purveyor of charismatic "spirituality" and superstition at best, and a simple warlock at worst.
People associate religious groups with their founders. Who doesn't think of St. Ignatius when the Jesuits are mentioned? What if it had later been revealed that Ignatius had been a sodomite and a pedophile rapist? I'm pretty sure the Jesuits would have ceased to exist within minutes of the revelation. Who would then have ever been able to have respect for the Jesuits ever again? Anti-Catholics would use it as ammunition with which to attack the Church. Similarly, it's impossible for people to have any respect for CMRI because of Shuckhardt.
If it's not enough for you that the CMRI priests drove out their founder to live out his life in oblivion and disgrace, then I don't know what you want. If you don't have respect for people who drive evildoers out of their community, then that is a poor reflection on you, not the people you for whom you have contempt.