I'll answer briefly:
1. It's above my pay grade. I.e., not required to save my soul. We're talking about the Crisis in the Church, NOT the Catholic Faith. So yeah, "I don't know", "leave me alone", or even "I don't care" is a valid answer.
2. The default position for a Catholic is not to declare the See vacant, but rather to assume validity. In this way, the Sede position is NOT equivalent to the R&R position, nor is it the "inverse" or a perfect mirror image of some sort. As I've said so many times, the Sede position is like taking an EXIT RAMP from the highway -- the default position is to keep going straight -- to accept that the Pope is Pope. Sedes might like to pretend it's a T-intersection, where some go to the right, others go to the left, and therefore the "move" of R&R and Sedes is of equal fundamental nature. BUT IT IS NOT. By default, we have a Pope. Taking the position the Pope is not Pope is a POSITIVE MOVE. We are not making a POSITIVE MOVE to declare the Pope is Pope, we are actually doing NOTHING. See the difference?
3. However, when the Pope is acting like the last several, one MUST disobey rather than commit sin or lose the Faith. In other words, I do the bare-minimum necessary to keep my Faith intact. That is what +Lefebvre did, and what I think is the most Catholic, safest, most prudent course of action.
4. What the actual truth about the Pope turns out to be? God knows. I sure don't. But at least I won't be punished for calling the Pope names, being uncharitable, burning effigies of the Pope, etc. In short, I'll have nothing to apologize for. God certainly expects me, at this time, to NOT follow the current Popes into Hell itself. End of list. He does NOT expect me to dis-entangle or solve the Crisis in the Church. Give me a break!
5. I'm not dissing or even rejecting Fr. Chazal's position. I just don't have A) the training or B) the objective knowledge of the situation to know if it's correct or not.
6. We shouldn't get the mindset that we need to be wearing the right jersey (having the right opinion on every nuance of the Crisis) to save our soul. Even if I was fervently excited about Fr. Chazal's writings, then what? I still have to choose from the AVAILABLE positions that offer Mass in my country. I can't try to search the world over for a person exactly like myself, who shares all my opinions on the Crisis, denouncing everyone else as a heretic. That's how you end up with cults like the Dimond Bros. or Pfeifferville. Or how to end up very alone, probably despair, and ultimately to lose one's very soul for eternity.
7. There IS a solution to the Crisis in the Church. But given the unsolved-nature of the mystery as of 2022 (around Year 57 of the Crisis) you'll cut me some slack, and admit I'm not crazy for being of the opinion that this Crisis is akin to a supernatural mystery, which mankind cannot solve with his powers of reason and "current available information" alone.
8. It's just my opinion, but if I'm wrong then the ONLY OTHER OPTION is that the Crisis HAS been adequately solved (in a definitive manner, with all objections adequately answered and addressed) but that all the other "positions" are populated 100% by those of bad will. I don't buy that.