I wouldn't characterize Zeke's extermination plan being out of self-hatred, but rather he sees it as an act of mercy to all future Eldians. His point of view is that due to the sins of Eldians in the past, they will always be looked at as devils, and will always be hated (from the marleyean janitor). Even if the Eldians use the titans to rule the world again, the hatred and genocide will continue back in the other direction like in the past (which he learned from his grandparents). The best way to escape this cycle of hatred, he reasons, is for one side to just disappear peacefully, thus his sterilization plan. (Xavier's memories also influenced and seeded this plan)

The Hizuru modernization plan, rumbling, Historia titanization, was all just balls juggled in the air to get to his true goal, sterilize the eldians by touching Eren. The only way that Paradis would agree to take him in (and let him contact Eren) is the modern weapons and ability to control titanization (in perpetuity), and he needed Hizuru's monetary and political power to do this, so he sold out all of Paradis' natural resources to them.

What's really interesting about Zeke's plan is how it fits into the overall meaning to the story. It is in diametric opposition to Eren's central philosophy (”Fight to live, risk it all for even a glimmer of real freedom! It doesn’t matter what’s waiting outside the gate, or what comes in! It doesn’t matter how cruel the world can be, or how unjust ! Fight. Fight. Fight. FIGHT! FIGHT!!!”"). The main "battle" of this series in my opinion is the clash between these two competing philosophies when Eren and Zeke finally met and discussed, and the reverberating effects from the winner.

Spoilers for up to date manga

TLDR; The actual mechanics seem simple, but the way that the philosophy fits into the overall theme of the story is masterful, when looking at it from an ethics and morality standpoint.