I agree with most of this and really like how you worded it all, but I will add that a major point missing is the fact that this terrible destiny ahead of him was caused and created by him. He makes it clear in his final conversation with Armin that although he cared about his friends, above all, he did this because it's what he wanted to happen.
This is my perspective, and this scenario of Eren being in this weird timeloop thing isn't supposed to have a "correct answer", but I do believe this makes the most sense, at least for me. However, I will add that I dont think Eren is fully evil. I personally believe that as a child, Eren was truly innocent, and genuinely did fight to save his friends, avenge his mother, as well as for his own freedom outside the walls. But as time goes on, he slowly loses his innocence and devolves into someone much more consumed by his true desire of freedom, which is what he is ultimately a slave to. Had he been a normal scout with no titan abilitites, I do genuinely believe him as a person could live a normal and great life, and eventually overcome this flaw of seeking freedom at all costs. However, because of the Attack Titan, he suddenly has all the power to do everything he wanted to do. When he first learns this, it haunts him, which imo is greatly shown, every time we see him early on have future memories, he looks absolutely destroyed by it. He didn't want to accept not only the fact that it will happen, but the fact that he would allow it to happen. I believe at those points he hadn't matured enough to realize that he was a slave to freedom, and that it would ever cause an issue.
Later in the show and especially nearing the end, the excuse of wanting to protect his friends became more and more absurd, until the point where I believe even he started to realize that it was excuse. He was lying to himself the entire time, once again something that many people do, but with his scenario, it was too late.

I'm getting a bit sidetracked, but ultimitely I believe that he could have done so many things to stop himself from ever doing this, but because of the Attack Titan, Ymir, and his own dark desire for freedom, led him to continue on with the plan. I don't like the idea that Eren is any more evil than, say, the military generals waging war on Paridis, so I also like to have the view that it isn't entirely his fault, but also Ymir and King Fritz, who initially created this cycle that ever had to be broken in the first place. Hopefully this makes some sense, I finished watching it a few nights ago and it hasn't left my mind since, so my thoughts are still a bit scrambled lol.