Uh, no. It's not. Naruto's Nindo is fucking stupid.
It's heroic and all and it makes for good storytelling, but Sasuke is a murdering shitbag at this point. Continuing to try and "save" him at this point because he made a promise when he was 11 to a girl he had a crush on is incredibly dumb and self destructive.
Sakura is RIGHT to try and get him to break his promise. He's throwing his life away in the pursuit of someone that doesn't deserve his help. His happiness and well being are more important to her than his stupid code.
I'm not arguing that Naruto's response is appropriate. It is.
I don't take issue with the fact that Naruto doesn't believe her, I take issue with the fact that the viewers don't believe her. I simply don't believe she's bullshitting as much as everyone is saying she is. I think she cares more about Naruto than Sasuke at this point and she's right to try and get him to stop.
For the sake of the story, she'll fail to convince him, but I don't get all the hate directed at her for trying.