Wow, such deep thoughts on a cartoon! ;-) Kind of fun, though! Here's my two bits, if anyone's interested ;-)
I think it's clear that in both Naruto and One Piece that some form of society or social order is under attack. In Naruto, it is embodied in the Hokage and the Hidden village, and is considered a good thing, and something to be protected and defended. Sasuke was a victim initially, no doubt - and is not responsible for what happened *to* him. However, when he makes his own decisions, he becomes responsible - even though the decisions may seem and even be pitiable. I believe that Sasuke is portrayed by the anime as forsaking the Hidden Village - and what it symbolizes - for his personal vengeance, while Naruto and the characters he influences (like the unsociable dude), come to understand what the Hidden Village strives to protect.
One Piece, though I believe is quite the opposite. There's a guy who's set his mind on getting friends together to achieve something great, and fun. He also has to power to right serious wrongs, but when he does so, an impotent society that is unable to effect the same good the Hidden Village does naturally labels him a criminal. In this case society is represented as very powerful and corrupt - quite the opposite of the Hidden Village - although various characters represented as righteous compose a part of this society.
That said, I have a lot of hope for Sasuke for the obvious reasons, but also because I believe he is forced to respect the Hidden Village (or at least acknowledge them), and he hasn't yet been forced to make a real choice between the Hidden Village and being a law unto himself (which in this case I think would make him amoral and a force for evil).
Anyway, just thought I'd throw in my two bits. It's not a thesis or anything, but I think a lot of what see in it is there.
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