Man, this question hits deep. Itachi's story is one of those tragic backstories that make you rethink everything. He was basically forced into an impossible choice by Konoha's higher-ups—the Uchiha clan was planning a coup, which would've led to a bloody civil war. Itachi, as a double agent, had to pick between his clan and the village. He chose the village, but also spared Sasuke because he couldn't bear to kill his little brother. The whole thing was framed as a 'test' for Sasuke's growth, which is messed up but also kinda poetic in a dark way. Itachi's entire life was sacrifice, and that's why his character resonates so much—he's the ultimate 'villain who wasn't really a villain.'
What gets me is how 'Naruto' frames this as a cycle of hatred thing. Itachi thought he could end the cycle by taking all the darkness onto himself, but it just screwed up Sasuke even more. That irony is what makes their relationship so compelling. Also, the way Itachi's actions tie into themes of power, duty, and love? Chef's kiss. Still gives me chills when I rewatch those scenes.