I for one see a certain irony in Archbishop Lefebvre’s doctrinal positions vis-a-vis his actions:
He complains that the Vatican II definition of episcopal collegiality takes too much authority away from the Pope, yet he then proceeds to usurp the Pope’s authority of selecting who to ordain as bishops.
He complains that the Vatican II view of Protestants as having some part in God’s plan of salvation is wrong, because no one is saved outside the Catholic Church, yet he then proceeds to place himself outside the authority of the Pope, being excommunicated just like Martin Luther, but nonetheless viewing the SSPX as having an essential part in God’s plan of salvation.