I share your experience to some extent Augstine, but it depends on when the FSSP/Diocesan TLM was established. If it was established after the MP, you have a good amount of Novus Ordo Catholics who like the TLM, but still want to hang on to their Modernism and JPII. I have been to Motu Masses where the only thing that is Traditional is the rubrics.
Let me also say that like the current SSPX, the FSSP is more Traditional in America than it is in France and if one thinks that Juventutem is the future of Traditional Catholicism in the FSSP/Diocesan circles, then TKGS point on pageantry seems accurate.
When I first heard about the Latin mass as a boy I wanted to go (sadly I didn't press harder for the opportunity, though I would not have been allowed to go St. Gertrude the Great at the time, when it was the SSPV chapel) because I believed it was traditional. That is a kind of principle, I don't think anyone denies that.
But
principle in terms of understanding
why Archbishop Lefebvre had the positions he had, is something entirely different than wanting to go to the Tridentine mass because you want to go to a reverent, traditional mass.
What is clearly unprincipled, is to pretend Benedict XVI is really traditional and has really significantly changed his views since 1988. That shows either a strong delusion or a willingness to deceive.