FE4's plot is somewhat overrated. I say that as someone who rates the game as his fifth or sixth favourite ever. It has an interesting setting more than anything else and excels at characterizing certain antagonists without needing to devote much time to it at all (and even there, FE5 helps a lot as far as Trabant goes), but the main story itself is pretty standard outside of the holy **** moments in the middle. Which admittedly are pretty nuts.
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Mistake you're making - overlooking the fact that we might not want to be saved.