Board Thread:Manga/@comment-29098965-20160719220900/@comment-27441457-20160720220750

It could be that Grisha failing to pass on the idea that the walled humans are a "cursed race" and the Warriors are justified in their plans would be enough for Zeke to consider Eren "brainwashed" by his father. It's a big exaggeration of the term in this sense, but that could come from how strongly Zeke holds his own beliefs. It's not that Grisha is directly sharing his views with Eren, but rather Zeke is so radical in his ideology that Grisha's failure to pass it on is enough for him to consider Eren brainwashed.

As for Zeke claiming that he and Eren are victims of Grisha, my guess would be that Zeke feels that Eren is at a disadvantage due to his upbringing giving him a positive outlook on the walled humans rather than unquestioned hatred. I'm not sure how Zeke could be considered a victim, but that might be revealed later.

The more I look at it, the Warriors seem to REALLY hate walled humanity to extremist degrees. I can't wait for the explanation on what humanity must have done to create such hatred in the Warriors.