@Eeliejun
Yeah, I dont get it either. Eldia has its back to the wall, having been facing extermination since the story began. If the only way is to destroy all other powers exterminating everyone else, most Eldians would pay that price. If its either us or them, the answer is pretty clear. Even more so the SC, which as you said, lost countless comrades in the fight. It was also misleading the number of people that greeted Hanji; in the fight with the Beast titan, Erwin was standing on a huge mountain of dead people. I think Isayama downplayed the number of dead, if there were more, that would kind of question the meaning of the whole thing.
I agree, it will be the scarf, or some other precious memento that awakens Eren and "snaps him out of it", japanese mangas are full of these sentimental stupidities.
also, these guys who want stopping Eren are going for an abstract goal: "mass murder is wrong, so we have to stop it, even if it means sacrificing our lives". that is utter BS. no one, i mean no one dies for "abstract values". People die for concrete persons. They give their lives for protecting their family, maybe even friends, and of course, you can die for your religion, like with the Christians, who die for Christ ( martyrdom), who was a real person walking on Earth. the japanese kamikaze pilots died for the Emperor, who also was a concrete person, and so on. And when it comes to concrete persons, the lives of Eldians are worth more than everyone else. it is very weird seeing this flipped upside down and the SC guys and marleyans suddenly becoming "humanists", who suddenly are concerned for all humanity now.
this is where mangas tend to screw up very badly: that the protagonist risks (and gives) his life for abstract principles. I see this in Vinland Saga, where the guy does not want to bring weapons to Vinland, because he wants to create a world free of conflict or whatever, even it it means that the natives will kill him. Complete and utter BS. If he did it from a Christian conviction, i.e. for Christ (a person), who by the way, never commanded walking around unarmed, but im sure it could be couched in somehow, anyways, that would be completely different. But of course, it has to be an abstract principle the guy made up in his head. Christianity would even make sense era-wise. But no, it has to be a "moral maxim", an abstract principle. No one, i repeat no one in real life gives his life for an abstract principle.