Easy. The pope is human.
Also, Sede v will never find a true pope. It's a dead end and a detrimental position. Sorry.
This, the "pope is human" answer is one of the least Catholic things I've seen here in a while ... in how you're applying it. We're not talking about pope as human being but the pope as the Rock of the Church, in his Magisterium, which has always been taught to be protected by the Holy Spirit. Obviously the pope is human, but he's also the Vicar of Christ, and with that come certain promises of Our Lord regarding the indefectibility of the Magisterium.
These stupid "pop" armchair theological maxims do a lot of damage and they're applied in a decidedly un-Catholic manner. Your "EASY" ends up being heretical in its implications.
Do you even believe in the indefectibility of the Church and the protection of the Holy Spirit over the Church, or do you believe it to be a PURELY human institution that can fail and falter as any human being might.
If Bergoglio and his predecessors were going around worshipping in pachamama temples on their own and Vatican II and the NOM had not happened, most of us would hardly care less; it's not our problem and let the Cardinals and bishops deal with him. Where it becomes our problem is when they're trying to impose a false Magisterium and blasphemous Rite of Worship on the entire Body of the Church, and we're left in the position of determining whether we can stay subject to them, as there's no salvation without subjection to the Holy Father.