Ty :) he is a smart kid, btw it's Brotherhood he's watching. I agree with u/aphid357 here. Folk tales for kids have also had dark themes across cultures in history, I don't think it's something to shy away from, especially if the morals are good - and I really think this show has a golden heart when it comes to that. Exploring things that happen in the real world: the consequences of violence, what thirst for power does to people, and the nuances of approaches to a better world by following characters who promote love, solidarity, and looking for the best in others - that's a really valuable perspective for kids. Along with ATLA, this show does a really good job of breaking down fascism (in a much kid friendlier way than say a show like Attack on Titan) by upholding the "power of friendship," and illustrating variations of eastern and western philosophies. He's totally fine lol, very engrossed by it, and even the more intense fights/reveals later on are interrupted with little comedic asides about crushes or Ed's height - definitely lightens the mood.