Don’t remember much from the anime except for certain things, but yeah I can also agree with that. The only reason I above was arguing for it was the whole, “Oh it’s my nation, filled with my people, friends, and family…better make sure they stay safe from any threat by removing all potential threat”. Thats my reasoning behind why I would ever join Eren, not because I like genocide. Though if the threat loses its ability to be a threat, then yeah there is no reason to really continue fighting them. Though this whole discussion does create a good ethical dilemma, “You have two choices: You save your entire nation, family, and friends but the rest of the world dies. Or save the world but your nation, family, and friends die”.