When the war against titans is a war against humanity

Most readers read Attack on Titan in the first part, will think it's a war between humans and monsters. If this manga stop there, it's also interesting, but the secrets makes it so much deeper. A world of tragedy. All main characters kill Titans or become Titans to eat or kill humans. The tragedy began from moment the Founding Titan Ymir had Titan power. That power, from the start, was not used for freedom. Instead, it served politic power. King Karl Fritz and the Yeager family couldn't offer a solution to the problem. King Karl had good intentions. His solution only brought peace to Paradis for 100 years. But he didn't anticipate the world's perception being different from that intension. Suspicion, hatred, and fear didn't disappear. Using the power of Founding Titan to erase their memories and imprison them within three walls left they lag behind in the outside world. It also deprived them of their right to self-determination. The question throughout the series is whether future generations must bear the guilt of their ancestors' actions?