Board Thread:Questions and Answers/@comment-29752445-20170929191254/@comment-1327106-20170929201409

As Eren Kruger says, the truth is probably neither what the Eldians nor Marley believe.

If you read the Eldia wiki article, you can see citation notes in brackets []. If you mouse over them you will see the exact chapter and page numbers those statements are taken from. Wiki articles are not allowed to speculate, only report on information presented in the manga itself.

If a truth eventually comes out, the wiki will adjust, but right now we only have stories from both Marley and Eldia's side of the war. It is possible that Willy Tybur knows the truth or something very close to it from the War Hammer Titan's memories, but he's so recently introduced who knows if/when we'll see anything from him.

As far as the "real" bad guys... I don't think there is one. The fact we're getting both sides of the story (and Kruger, who knew more than the rest of the cast, doesn't bother to pin blame) shows that Isayama isn't interested in demonizing one nation over the other.