If the entire hierarchy can apostasise and lead the faithful to Hell without it being considered a defection, then the principle of indefectibility would be entirely meaningless. You won't find any theologian or authority suggesting such rot as the true hierarchy could ever lead souls to Hell.
So the entire hierarchy defects, so what, they are not the Church.
I can't comment on what graces I've been given, only God knows. If the Trad position is correct, then yes NOers must be ignoring some of God's graces, as if one corresponds to all of God's graces He would never leave them wallow in error. But whether they are rejecting graces or not, it does not change the fact that the hierarchy is guiding them to Hell. Trads ignore the hierarchy for exactly this reason. The fact that man must listen to the hierarchy doesn't lessen the significance of what they are doing. It's like if a father teaches his child to sin, the child has free will to reject his father's errors, but that doesn't absolve the father of his guilt.
Yes, the hierarchy is leading them to where they want to go. They choose to follow because they rejected the very same graces you did not reject, the same graces you corresponded to and are corresponding with, they want nothing to do with, they're content to sin - they choose to reject grace and follow the hierarchy, each and every one of them. You are not unique here, we all, every last one of us at some point(s) in life has to make the same choice. So while you place all the blame on the pope and hierarchy, you ignore the reality that the people being led into the pit, chose to be led into the pit and ultimately in eternity, will not be able to blame anyone except themselves.
Why is it that you even need a pope when you ignore him and everything he does anyway?
It's honestly baffling to me that you can agree that the hierarchy are leading souls to Hell and yet you don't think that poses any issue whatsoever with indefectibility. From the Catholic Encyclopedia once more:
I don't need a pope like that, no one does. Our duty before God is to pray every day for the pope, that is what Catholics must do. Whether a holy pope or a conciliar pope, if he never teaches anything at all during his entire reign, or if he teaches heresies every time he teaches, it is the same difference - but until or unless he defends or teaches something we need to know, no one needs a pope to get to heaven.
Sedevacantism would be a defection by loss of Apostolic hierarchy. R&R have a hierarchy, but one that is corrupted in faith and morals and has ceased to be a school of holiness as it teaches heresy and sin instead of true dogma, as well as having an invalid and blasphemous mass replace the true mass in 99% of parishes. Even their pope was ordained in a false rite.
So it's clear that sedevacantism cannot explain the Crisis, but neither can R&R as that position still violates the principle of indefectibility.
But you just said what is - namely, that the hierarchy is corrupt, including the popes. There isn't anything to explain about that - they are not the Church. We can say as you just said about the hierarchy, we can say by all accounts, they have defected from the faith, defected from the Church and are bunch of scandalous bastards, but we cannot say the Church has defected because that is an impossibility.
If in fact the Church has defected or ever does defect, then by what means do we have to get to heaven? None. Which is to say if the Church defects, salvation is absolutely unattainable.