I think we can all agree that the Holy Sacrifice of the Mass is a most sacred action. It is the only way on earth we can truly possess Our Lord Jesus Christ. If one holds the Pope in true contempt and thinks of him as a heretic outside the Church and a true enemy of the Faith, then naming him in the canon would seem as a stain (at the very least) to the sacredness of the Liturgy. Mons. Des Lauriers thought of it as that, a stain. It is a contradictory position, because what we would be saying in the setting of the Holy Sacrifice is that we are una cuм...in union with a heretic and under his authority.
It does not make sense, unless one fully recognizes the Pope of Rome as such, this is, the true Vicar of Christ on earth and remains in full communion with him with a good Roman Catholic submissive disposition. Both Masses non una cuм and una cuм are, I think, valid, but I don't believe the latter is reasonable for R&R priests, in a particular, when including the name of the "heretic" is quite meaningless. We are saying at least externally that our souls are in union with an enemy of the Faith. There seems to be just something wrong about that.
Faith cannot contradict reason.