He based his plan on the history of the Shinobi World & Itachi's life. He wanted to eliminate the major sources of conflict (Biju, seperated villages) by ultlizing a method that had proven to ensure unity amongst them.
Throughout history, Shinobi always sought after the Biju's power so they could use them to better ensure their authority over others. This led up to an entire war with the world at stake being fought over them.
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He wanted to eliminate them so no one would ever fight over & abuse their power again.
The Five Great Shinobi Villages united for the first time in history only because they had a common enemy that they couldn't possibly defeat alone - the Akatsuki, under the command of Uchiha Madara, who had gathered 7 of the 9 Biju and were aiming for the last 2.
With the Akatsuki gone, Sasuke believed that the villages would eventually separate and go back to fighting one another. To prevent that, he was going to be the common enemy that kept them united.
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Everyone could live in peace, they just know that there's a god-like being who could/would strike them down if they cause trouble. Would the average citizen be scared of Sasuke, or criminals?
Sasuke was going to be the only one of the darkness, so no one else had to. Taking on everyone's hatred, so they wouldn't hate each other. Protecting from the shadows, as Itachi did, except on a larger scale.
- Uniting everyone through a common enemy was shown to work via the Akatsuki with the Five Great Shinobi Villages & Samurai. Plus during the warring states era Madara was said to have used his power to unite clans.
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- Maintaining peace and order by being a God-like authoritive figure was shown to work via Pain with the Rain village. Kaguya was also stated to have subdued all lands.
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- & Itachi protecting from the shadows by playing the role of villian, taking the blame & bearing everyone's hatred avoided a potential civil war with the Uchiha against Konoha, and potential world war with other nations.
Sasuke learned from his predecessors & improved. Ultimately forming a better plan for peace than them.
Whereas Hashirama and Naruto's plan of cooperation through friendship was proven to not work via Hashirama creating peace through the village system but things going sour after his death.
Meanwhile, Sasuke had the capability/ambition to always be around to watch over the world.
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Although Naruto's plan is better than Hashirama's cause he has Sasuke on his side. After convincing him to work with their allies. Now Sasuke is protecting from the shadows by going on covert missions to gather information & only became an enemy to the criminal underworld to subdue them.
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