I am hardly an expert on these matters, but it seems to me obvious that if the SSPX operates by virtue of a canonical status that has not been revoked by unjust procedures, and/or by virtue of supplied jurisdiction, then it has the authority to bind its members as provided in its constitutional docuмents, and its members are obliged to obey their superiors unless they are commanded to do evil or what clearly conduces to evil.
I also think it obvious that a member of the Society can't simply walk away from commitments that he has made before the tabernacle.
+Fellay made the judgment that a no doctrinal strings regularization was something that should be done. He had the authority to make that decision, and he made it. It think that the members of the Society were bound by it. Now I can understand someone feeling so strongly against +F's decision that he would decide to leave the Society. I don't know that such a man would have the moral right to do it, but I understand what he is doing. But I don't understand how a dissident can say that he and those who agree with them are the true society. If they were to go off and start their own Society and call it The REAL SSPX, I would understand that. But to hang around and disobey orders and make trouble? This is heroic? This is holy? In particular, is it heroic and holy when Rome has rejected the no strings doctrinal regularization, and the Chapter has made quite clear that the Society is where it has always been?
This is not a Hollywood movie in which a handful of cool and wonderful dudes stand up to the establishment and win out at the last moment. If there is not continuing authority in the Church, from the Pope down through +Fellay and the District Superiors and th heads of the priories, then we can all do what we jolly well please, and that is not the Catholic faith, in spirit or in letter.