If you want an example of why I think the exercise of Papal authority to tamper with Tradition is not simply blasphemous but completely arbitrary, then look at the example of the Octave of the Sacred Heart - established by Pius XI in 1928, only to be stripped away less than thirty years later by Pius XII in 1956. You must remember from last year that I don't think very highly of the feast of the Sacred Heart, its cult (like Lourdes) being the province of those ill-informed pious women who care not for Tradition (unlike we loftier catholics and our pre-1911 Office) but rather for some tacky popular piety where the Sacred Liturgy has no place. Similarly Pius X's treatment of the feast Corpus Christi in the wake of the 1911-1913 reforms (which the Traddies in their ignorance accuse their local bishops of). If the Papacy has some actual purpose in the Church, I feel compelled to ask, are these good examples of that? Shifting stuff around to no purpose, kalendar reform, etc? Does this supposed authority emanate from Christ? Is this what Tu es Petrus is about? Tradition has auctoritas as coming to us from the Holy Fathers and interpenetrates with the Scriptures (I think even Dei Verbum says this somewhere). So if Tradition says that the feast of Our Lord's Ascension has an Octave, the feast of the Ascension has an Octave, and the pope's authority to abolish it is utterly void. Essentially he has not abolished it (since he has no authority to do so), he has just willed that his church no longer observes the Octave, bringing millions of innocent Romans into schism with that august and godly Tradition.
It angers me that the Traditionalists suppose that the Church was in a sublime state between 1928 and 1956, since they all love their sacred hearts, immaculate Marys and faux-shrines - they'd sooner, for example, organise a High Mass with tacky devotions for the Sacred Heart than a day of Liturgy in honour of Sts Philip and James on the liturgically correct day. How are you being ''traditional'' by celebrating an arbitrary and worthless octave that was rightly abolished soon after its invention? The short answer is that you're not! The Roman Church has absolutely no sense of taste or Tradition whatsoever. If the ultimate legacy of the Latin liturgical tradition is plastic holy water bottles in a tacky shrine in France, or ugly portraits of the Sacred Heart suspended over the fireplace, then something has gone ever-so-slightly awry, no?