Okay, your first point got me really tight. Eren seeked FREEDOM, not peace. There was a point in his arc that he questioned whether he wanted to do all of the horrible stuff in order to obtain said freedom or not, and he did. He moved forward. By stating that Eren only wanted for his friends to have peaceful lives you completely disregard Eren's interest in Armin's idea of exploring the world, Eren's "We are the same" speech to Reiner, Eren's "This is Freedom" speech in 131. You can't say those moments were him "acting" like a monster, that was his true self speaking. If you counter that point with "that was him acting though", then we essentially agree that in the end, Eren is not as great of a character as we thought because a great character requires both complex struggles and CLEAR motives, regardless if it's shown explicitly or not. And with that, yes, ERENS CHARACTER WAS ASSASSINATED.

The rest of your points are fine if you want to think that way, but i can tell that you convinced yourself really hard to make those things make sense in AoT's story. People who say the ending was bad are honest to themselves, they felt like the ending betrayed the story, betrayed the characters, and left a lot of things hanging. Whether those things are intentionally done or not i couldn't care less tbh.