Allow me to float a theory:
- The fundamental assumption held by Catholics is that the Holy Spirit works through the Church and hence the pronouncements of the Church are true.
- The fundamental assumption held by Radical Traditionalists (to a greater or lesser degree) is that the pronouncements of the Church are false (esp. in the area of liturgy) and hence the Holy Spirit is not working through the Church (and the Church, by definition, is no longer the Church).
In short, the argument is over this relationship:
and the ordering of the argument. Both use personal experience to establish truth (somehow the truth of the Church must become my truth and a purely rational system of theology does not exist) but the argument is really over the state of the Church before experience.