Wow! To them, somepony saying that Celestia can get things wrong is like a Christian, like me, saying GOD can get things wrong... I'd go as far as to say it's outright BLASPHEMY.
BUT... Twilight being Twilight... she HAS to have a reason, right?
I know very well, thank you very much!
From the very beginning, I've always equated Celestia as being like The Pope; i.e. she's the closest thing to "God", or whatever Higher Power these ponies believe in.
I'm sure plenty of others have noticed the exact same thing. Therefore, my conclusion is that there is some from of representation of Christian beliefs in FIM.