The character writing in this show is some of the most overrated and frankly soulless I have seen in all of fiction. I don't understand why the post-time skip part of the story is praised like a masterpiece when the conflict is contrived and absurd especially in the final arc. The story tries to portray the conflict as a complicated and morally grey with there being no true good side but it completely fails at this by making all of the outside world comically evil to the point that Eren's Omnicide is the only option to save Paradis. It's beyond ridiculous that all of the world's nations and people hate this one race to such an insane degree that the only option is too kill everyone else.
If things had actually made sense, diplomacy would've save everyone. With threat of Marley, the world should rushing to make a deal with Paradis for support against Marley. With the Eldians and more advanced technology, Marley would be screwed and Paradis could use this deal to strengthen it's geopolitical position and improve international relations.
Anyways, its just my opinion. You may like absolute dogsh*t animes, idc. You guys like aot? Cool. I don't. That's cool too.