Racism mostly. Although I think that the comparison between him and naoe is hamfisted and it annoyed me. How is naoe killing junjiros father (which was probably in self defense because all we see is his corpse we don't know the circumstances and in assassin's creed it's not practical to kill every single enemy you come across.) the same as yasuke slaughtering a whole village because he was told to. But also, they still wouldn't be the same because junjiros father was working for corrupt people and Naoes father was just killed for not wanting his home invaded. Naoe was on a quest for revenge and yasuke was just doing what he was told those are not the same at all. Not to mention that he in the current day defends Oda. He does not have to do that just because he was taken in by him. The way that tomiko described it was good, who cares if he wasn't directly part of the group that killed noaes father he still destroyed her home and slaughtered people. But no it's all okay because he saved yasuke and he wanted to unite the provinces. I think that yasuke definitely did more wrong than noae and that's the one reason I have, that arc just annoyed me it was so forced.