Tbf to Harald, he doesn’t have much of a choice. He wants Elbaf to join the global society and repair their old reputation, and that drive is an overcorrection from his past self. He constantly carries guilt and responsibility, so he’s fixated on mending everything, but that same guilt is also clouding his judgement.
He also probably thinks he has no right to fully reject how the World Government operates because of said guilt and Elbaf’s violent history. It’s all of that combined, plus the fact that he still doesn’t have the full access to info like we do.