The "sound argument" of the title refers to the cold logic that sacrificing one individual (Historia) is a necessary evil to save the nation.
The episode concludes with the realization that while the plan was logically "sound," it destroyed the very humanity the Survey Corps fought to protect. Attack on Titan - Season 4 Episode 10 - "A Sound Argument" 10 : A Sound Argument
: The episode highlights the growing instability of Eren, who has grown cold and detached, alarming his closest friends, Mikasa and Armin. The "sound argument" of the title refers to
The story begins with the arrival of Lady Kiyomi Azumabito, the first foreign guest to visit the walls of Paradis. She reveals a hidden lineage: is the lost descendant of the Shogun of Hizuru. While the news brings a glimmer of a possible ally, it comes with a steep price tag: Zeke Yeager’s "Three-Point Plan" for Eldia’s survival. Zeke's Plan and the Sacrifice Zeke’s strategy involves: The story begins with the arrival of Lady