Is this place not pro rumbling?
A small country with no knowledge of other humans is hated by the outside world and the outside world is planning to exterminate them (after they've been torturing them with human eating monsters for decades and live in ghettos on the mainland) Their hatred stems from the belief that they are evil when really a young girl was raped and a made a slave to a tyrannical king 2k years ago.
Small country eventually finds out about the rest of the world and how they want to kill them all. They try peaceful talks but it fails and they're outright told the world is moving ahead with exterminating them. Person from this small country has a way to prevent their country (that again didn't do shit to anyone) from being exterminated by racists. He uses it. Libs cry that he's a bad guy for not letting racist xenophobes kill and enslave his entire ethnicity because apparently killing too many Nazis makes it worse than killing a smaller number of innocent not Nazis in their mind.
Yes yeagerists are protrayed pretty fashy in the manga and they are but the only mistake made with the rumbling was going 80% and not 100. Yams is just a shitty writer who can't end a story.
Also I don't want to hear any "revolutions are wrong because innocent people will die" adjacent crap.