Post characters who did nothing wrong.
Oberstein legit did nothing wrong
Claus von Lichtenrade had to go. The alliance between him and Reinhard just wasn't going to last without there being a common cause in opposing the Lippstadt-rebels.
If you're talking about the gay redhead, the momcon hetrochromia, the phezzani jewlord, the earthfag leader faggot, fake stalin, the corrupt politican who was never without Job, the dumb brute high admiral or the pigheaded leader of the High Nobles than I'm sad to report they killed themselves. Oberstein was hardly to blame for any of their deaths at most he nudged them in a suicidal direction or didn't bother to correct them.
Only counting original manga. LO does not exist.
Did you watch LOGH? Oberstein was vindicated.