[ex-snook]

"Accepting for the sake of argument that the Church is infallible, how does that allow for evil popes? "

A bit of misunderstanding between sin and infallibility. Infallibility only applies to matters of faith. The question is not, can the Popes sin but did they pronounce some error in defining a matter of faith.

[Elsie]

The question is not, can the Popes sin but did they pronounce some error in defining a matter of faith.

They sure as HELL 'erred' in matters of PRACTICE!