I guess it's a poetic endingExcellent game, one of the best I've played.
However, I can't be the only one who thinks that leaving such a dangerous book just like that is asking for major trouble. It's shown that we keep it with us for quite a while and then suddenly just forget about it?
Power and control is trivial when you are surrounded by happiness with people who love and care for each other that's why it has a beautiful ending. (It would make more sense to you if you play the other ending where you accept the power)
I know it's CLICHE as it's doesn't reflect reality and it's a fantasy of an idealistic world.