lol True Peace was impossible . Did you read latest interview of Sasuke going on Adventure around the World . It was meant to stop people like Kaguya from rising . He was indeed a Dark Knight .
Naruto is like Harvey Dent always needed help of his friend to achieve something .
True peace is impossible. Yet Naruto strives to that goal, that's what makes him a powerful character, he's reasoning to never give up. He was born for this moment.
Sasuke is going on an adventure around the world but nothing indicates he is out here governing lifes, thousands. You also realize Kishimoto said it to himself that he made Sasuke go search for Kaguya so he could have something to do, he knew Sasuke could not asspull his way back into the Village as if he did nothing wrong.
Yes, Sasuke in terms of what he does is similar to the Dark Knight, but you are mistaking from similar to exact. In no way, shape, or form was Sasuke helping Konohagakure progress. He was helping the village, but not the core. He decided his life would be better suited to doing missions (probably) and staying out of main economics of creating this new system of peace.
Why Naruto continues, learns, grows, and studies for his goal ... you will defintely understand what makes him different from being stationary and progressive. Funny you said.
"Naruto is like Harvey Dent always needed help of his friend to achieve something ."
-Sasuke has never done anything on his own
-Sasuke changed because of NARUTO. Clearly, you aren't reading the manga called Naruto. Naruto made a part of who he is now U_U
Naruto already changed throughout the story with the help of Iruka, Jiraiya, Minato, Kushina, so forth. He was already a "man" in chapter 688, look at him ~
True peace is impossible, so what is unrealistic about not trying to strive for it? Is it better than doing nothing?