User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-16281343-20150718161758/@comment-26700459-20150722101136

@anon, Probably the reason why Diehauser wants revenge because of the the incident where the member of his family was involved. Cleria Belial to be precise, the inciden which has been long forgotten by the current govenment.