After seeing foes like Lassic (a tyrant), humans (well, us
), Orakians x Layans without knowing their real enemies, Zio was too predictable, the good old "I wanna destroy the world" guy. PSIV story is "OK", but it carries too much RPG/anime/manga clichés and pales in comparison with the other three "OMG, how can they do that in a game" PS games.
A person only sees and hears what he wants to see and hear and disregards the rest.