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Hi anon, you're uninformed, and need to factor in the light novel and the Will audio drama. Spira is starting to fracture because of a lack of a shared enemy, and because the Guado were genocided by the remaining Ronso, the Farplane hasn't been maintained as it should be and is starting to leak into the world of the living. Through a process called beckoning, people are starting to recall their loved ones from the Farplane. This sounds nice, except the people are also collectively beckoning Sin, as the problems of a divided Spira are too complicated for them to solve, and the unity they all felt in fighting against it no longer exists. In other words, the complete dissolution of tradition has in the long-run been a net negative for the world of Spira, and Yevon was wholly unironically right.