Even Tumblr, with all their SJW politics, agree that AoT is shit:
Swaths of them already came to hate it because they were stupid enough to believe that a story that actually puts faces and moral diversity on the eventual victims of omnicide had a subtext favorable to fascism. You might as well discuss the moral shortcomings of the Jewish community with
Mein Kampf.
Because Eren is the most super trust worthy narrator in the world, right? We take it on his word of a future we never get to see or experience. He never says why it is the only way. He never elaborates why nothing else will work, only that this one will work.
His conclusion upon seeing that future is that,
necessarily, nothing else worked. The final chapter is due for release in a week, and there's no contradictory evidence that he saw anything other than what he says he did in his
internal monologues.
Eren has access to causality and this is his best plan.
He has access to memory transmission between Attack Titan shifters, no knowledge of their contexts beyond what can be gleaned from their surroundings, and no knowledge of this ability until Zeke headbutts him in P A T H S. That is the extent of his time transcendence. You may as well ask why
Zeke didn't come up with the idea to do literally anything aside from seizing the means of reproduction from every Eldian and ensuring that their community would wither and die in a meandering existence with no way to procreate.
That aside, I also mention that the immediate salvation of Eldians isn't the only thing on the plate-- there's also the definitive solution (a "final solution", if you will) to the cycle of hatred that they've all been broken on. Their proposals are heavily mired in their own personality and experiences. Eren's always yearned for freedom, and he kept finding out that he wasn't free at all-- first, when he learned of the outside world from Armin, then when the Titans broke into the Walls, and then when they got to the basement. He ends up finding out, finally, that the whole world wants them dead (and for good reason, no less, seeing as they can turn into giant rampaging monsters at the drop of a hat despite looking human at first glance)-- his final solution, between his (however potentially imperfect) conclusion from his future vision that nothing the SC could come up with was going to allow them to avoid using the Rumbling without sacrificing Historia and her entire bloodline OR just submitting to annihilation, and the knowledge that even the Ymir Fritz with all her power was a slave who was consumed by her descendants who were then consumed by theirs over centuries (not unlike what was proposed for Historia), is to erase that whole world, and inter that hatred and fear with their bones.
On the other hand, because he lived his childhood being raised as a tool by a radical whose pride in him was wholly contingent on whether he could carry out his mission, Zeke hated his life so much that he wished he was never born, and then met someone who felt the same way and was willing to be what Grisha didn't think to be for him: a father. His final solution, as to carry out the will of him and his "father" is to genocide Eldians through taking away their ability to reproduce (you know... as opposed to genociding the rest of the world). Even Gabi has a proposal, as naive as it is, possibly because of how young she is: slaughter the island Eldians to prove that they're the "good ones".
I won't regail you with the imperfections of all of their proposals (since I already did), but suffice to say
that's the whole point, and Yelena points out that there
is no perfect solution. These are just the solutions that
they came up with, and the reason why they all end with genocide is because of the enormity of the issue they seek to combat.
...And for all your touting about the author's right, the author is specifically say exactly that through Mikasa. Another thoroughly unreliable narrator.
The narrative details an alternate timeline (I pivoted back to it being an alt-timeline because Mikasa saw what Eren's face looked like well before she entered his final form's mouth) where Eren "abandons everything" with Mikasa likely because her deviating from Eren's future vision granted him the sense of freedom he wouldn't have had otherwise, accordingly breaking his already tenuous will to commit omnicide.
It just happens that the surface level of all of that is whether Mikasa'll get cold feet confessing to Eren.
You do realize that the Romans didn't destroy the entirety of Carthage itself, right?
Probably not for a lack of trying, given that
"Carthago delenda est" is regarded as possibly the first recorded incitement to genocide.
What Rome did is what literally everyone in this thread is suggesting, destroy their ability to fight and its over.
For how long? As long as fear of the Titans rightfully exists, the rest of the world won't ever welcome Eldians. Even if Eren made like Sylvester McMonkey McBean and took away the Eldian's ability to become a Titan, it wouldn't remove the animus because the oppression of the Eldian at its lowest level is revenge for the oppression the Eldians of times past dealt upon the world. How many times will they have to stomp out the military might of the other nations? How many people will they have to kill
over that unbounded time period, whether you consider it intended or collateral? How long will they be able to do so effectively, before the rest of the world adapts? How often will they have to do it?
I don't bring up those questions in full-throated defense of Eren's idea, but I
do bring them up to expose the imperfection in your own proposal. Depending on how all of that would play out, you'd quite possibly be killing more people than you would have in the omnicide.
For as long as they prove useful in warfare, they'll continue to be used as fodder, and at the point that they stop being useful, they'll only be able to serve as a liability (because, you know, they can turn into rampaging monsters at a drop of a hat for all they know). They could never let go of the enormous power of the Rumbling because of its use as a deterrent, and they'd have to subject an entire bloodline into eating their parents and then being eaten by their children before they expire thirteen years later.
That segues into the general issue that principally Eren and Zeke are looking to solve, the aforementioned cycle of hatred.
Not to mention ROFLSTOMPING a single city (Carthage) and the ENTIRE FUCKING PLANET are two different things entirely.
The differentiating factor is the number of people given that Paradis had war declared on them
by the entire rest of the world, and the entire rest of the world was prepared to genocide them in six months.
Trying to justify genocide is hilarious.
While my "cycle of hatred" discussion is a recent development, I don't think I've ever tried to make morally right the concept of genocide. All I
have said is that it's understandable why someone like Eren, in his particular circumstances, would opt for that option (and how initially reluctant he was!). It's also completely understandable why Zeke went in the inverse direction and decided to make Eldia the sacrifice for that freedom. They're not morally
defensible, not just because of the moral import of such a mass killing, but also because they're not complete solutions (because I didn't detail Eren's imperfection before: the omnicide doesn't prevent conflict
within Paradis, and doesn't prevent it in the future, should humanity spread out more).