Pardon me for all the terms I'll be using in this post but as a warning, I will just state that I am currently obsessed with the Divergent Trilogy by Veronica Roth! It reminds me a lot of The Hunger Games with just a little less violence & more of the dystopian-ness.
Anyway, the books have taught me a lot despite its unrealistic nature (I doubt the world gets divided into 5 factions even after 100000 years). I saw how individualistic & uncontainable the human spirit is. No matter how you try different ways to control someone, his relative choices will still prevail. His actions are the impact nonetheless. Everyone is entitled to his opinions. Free will is indeed free.
Beyond anything, the lesson that really stood out for me would have to be the general truth that visceral actions are the way to go. Do whatever you think is right & what makes you happy. Even if the society resents it, be radical & stay that way. You are the boss of your own life. You are not Abnegation, you are not Dauntless— you are Divergent.