Well, that's an easy answer.
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Because honestly, who else could it be?
The whole idea behind the cycle of hatred is that if you kill, you're just gonna create more hatred and perpetuate it. And while we have many heroes and badasses in this story, Naruto is the one who broke it. Naruto is the one who rose above and didn't kill.
Its what makes him the protagonist instead of someone like Itachi or Hashirama. Even with how perfect and noble both are displayed, Itachi still killed his clan, he perpetuated the cycle of hatred. Hashirama still killed Madara, he perpetuated the cycle of hatred.
Naruto didn't. He broke the cycle. He redeemed Sasuke and he redeemed Nagato.
And thus he rose above.