Let me make some things clear: 1.- The only action of ,apparently, believing in a lie in order to obtain a goal is HYPOCRISY:http://dictionary.cambridge.org/es/diccionario/ingles/hypocrisy 2.-Now, like I have been saying for some times, Mia would be a well-written character if, amongst other things like watering down her level of kindness (nobody in real life is THAT kind), the game showed us her real thoughts about the lighthouse in a subtle way (dialogues could be accepted, but the most important parts are thoughts and actions). Since nobody except the item seller in the town knew about the Water of Hermes, and since not even Mia mentions or thinks about that BEFORE the battle with Saturos, I would easily give you the reason: the character are not hypocritical... the game IS, when rewritting them. Oh, and something I forgot to mention: most (if not every) of the characters are pretty much bland, archetypical and, with the "the world is dying without alchemy" twist, pretentiously written...