Board Thread:Manga/@comment-26624146-20170826063316/@comment-24407809-20170826065248

Well, there are a number of reasons Zeke probably doesn't feel the same guilt for his actions that RBA do. Chiefly, he hasn't spent time among the Paradisians like they have. Granted, he's been to Paradis, but that's not to say he has interacted extensively with them. Besides his conversation with Mike, the battle at Shiganshina, and his conversation with Eren, he's never talked to any of the Paradisians. In fact, he spent around two months in the abandoned Shiganshina District with only Reiner and Bertolt. And you could easily argue that what little he's seen would reinforce his idea that they're "devils". The only times he's ever interacted with them, they've been trying to kill him (granted, he was always the aggressor, but still), so they wouldn't exactly be pacifists in his eyes.

As for Reiner and Bertolt, they definitely would not have reported any of what they saw to him. Remember how Reiner's family reacted to his story? If Reiner or Bertolt ever gave away any information that would contradict what the Marley government tells the public, they would most certainly be executed for treason, so I highly doubt they told Zeke anything that would have changed his worldview.

Zeke was also doing a lot more than just pretending to play baseball when he killed Erwin and the Corps recruits. In fact, I seem to remember him getting very upset at the fact that he was being forced to kill them because their memories of the outside world had been taken away. Him pretending to be playing baseball was obviously a coping mechanism for him so that he would be able to kill them.

I've got my own theory about why Zeke turned his parents into the Marleyans, but I don't have the time to lay it all down now, so I'll just write this paragraph based on the concrete information we have from the manga. Zeke turned in his parents to the Marleyans because, from a very early age, he was force fed two conflicting ideologies that both claimed the other was wrong. Grisha himself acknowledged that Zeke probably chose to believe the stories the Marleyans told him because Grisha and Dina neglected him as parents and only ever treated him as a means to topple the government. It's not hard to see how a child growing up in such an environment could be swayed down the wrong path.

So, bottom line, I'm saying no. I don't believe Zeke is the main antagonist of the series, I think he's the most tragic character. Someone who has been brainwashed into believing in a twisted ideology, and forced to do things that he hates, simply because his parents didn't care about him as anything more than a means to an end.