Membership in the Catholic Church is different from memberships in other religious groups. Unlike other religious bodies that insist on members accepting the authority of holy books or certain practices, the Catholic Church insists her Pope and bishops are the successors to the Apostles and have the same authority which Our Lord gave to the Apostles. To reject the authority of the Pope and bishops is far more serious than a Presbyterian rejecting the authority of his minister. The Presbyterian can go to another denomination or to another church within his denomination and still be Protestant. But a Catholic who denies the teaching authority of the Pope and bishops has damaged their relationship with the Church we profess was founded by Christ.
That’s a serious matter. The person for whom membership in the Catholic Church is important, must justify rejecting the authority of the Pope and bishops in communion with him by arguing that he is not in opposition to the Church. Rather he is being faithful in larger matters. The people who do this have different motivations and political leanings. Some try to argue that the Church teaching is harsher than Our Lord ever intended and this justifies disobedience. But others claim that they follow the Catholic teaching as it was always practiced, claiming that the Church fell into error beginning with St. John XXIII and will be in error until the Church rejects Vatican II and all the changes which followed. This is the position of Radical Traditionalism.
Before continuing, we need to make some distinctions. A radical traditionalist differs from the Catholic who simply prefers the pre-Vatican II form of worship and devotion (commonly called “traditionalist.” [†] The traditionalist may wish the Church handled things differently, but recognizes the magisterium today has the authority to decide on these matters and seeks to obey despite misgivings over their prudence. The radical traditionalist rejects the authority of the magisterium when that authority challenges something they hold dear.
We need to remember that while all radical traditionalists are traditionalists, not all traditionalists are radical traditionalists. So we need to be careful not to assume that a Catholic who prefers the extraordinary form of the Mass must be guilty of disobedience. All A = B does not mean All B is A.