The Nine are not the whole reason, they do exemplify the situation tho.
As for me, while I do believe the pope is the pope, I could not care much less whether or not the pope is the pope - he's a heretic, and whatever his status, we are told by Our Lord that we are not to listen to heretics. It's not complicated.
But Stubborn, that is easy for you because it fits your personality. Others see that we have only had heretical popes since V2, they might feel betrayed because God said he would never leave us without a head, so when they try to figure out the situation, they come up with a different opinion that fits their personality.
I guess I just wish people would recognize that we all look at this from different angles and though we can discuss these angles, we have no assurance that any of us are looking at it God's way. The only Truth we do know is that there are Faithful Catholics both inside Rome and outside Rome, who are hoping that God fixes this Crisis soon.
If a good and Holy Pope comes and says that the seat was vacant since V2 due to impediments and heresy and filled with an anti-Pope, would you follow him? Or what if this good and Holy Pope says that it could be that some person could be elected to the Papacy and have the abilities to do certain things, like make Cardinals (Material Pope), but he didn't receive the authority of the Holy Ghost to teach, govern, and sanctify (Formal Pope), then would you follow this Pope?