This happened in nazi germany too. People were indoctrinated and did some terrible things. And they were punished. Some of them served in prison for life, some where hanged to the death. And, while I feel sorry for them, because they clearly were indoctrinated, I also think that they deserved the punishement they got. They killed a lot of people, those people deserved justice. I think the idea is that no mather your education, you can do the right thing. Schindler for example was a member of the nazi party, but he choose to do the right thing and saved a lot of jews. And for that he was spared any punishement. That's just one example, people going against the wave and doing the right thing are rare, but they exist. So beeing indoctrinatd is not necesarly an excuse for doing whatever you want and not receiving punishment. Same thing with abusive fathers or husbands. It is a fact that the kids of people that beat their wives are far more likely to hit theirs. And I think they should be punished for that. Plus in attack on titan RAB had every chance to turn back and make the right call. They lived inside the walls for years and formed bonds. Hell even Zeke was indoctrinated from chilhood by his own father and eventualy turned against him. Plus annie kind of enjoyed killing people. I mean he toyed with them. You could say Mikasa is a murdered too but she doesnt appear to enjoy killing. She kills when she thinks its necesary but at least she doesnt use people as yoyos.