I think what kishimoto meant about the sasuke is pure thing is that sasuke is a honest character, he is blunt, and thats why i never bought any kitten about Sasuke lovin g Sakura secretly and never expressing...even once!
Sasuke is blunt the same way fascist are. They state outright what they want, which almost always amount to "taking away peoples natural rights". I could use many words to describe such people. "Pure" isn't one of them. I get what your trying to say though.
Kishimoto used that word as a way to try to soften what Sasuke did in the story. Oh he isn't a murder he's honest to his heart. Oh he isn't a terrorist he just wants to change the world. Oh he isn't trying destroy free will and mankind's natural rights, he's trying to bring about peace because he loves people to much. It's the worst kind of moral relativism that a creator should be beyond. Since Kishimoto thinks he is making some kind of Earth shattering story about how peace can be obtained though he misses that point ,and instead comes up with foolish and shallow ideas that a ten year old may come up with.
Here's a newsflash Kishimoto wars don't start because "people love to much", and world peace isn't going to happen because the nations of the world unite to fight an outside threat. I've said it before but I'll say it again. Every time I hear the themes Kishimoto attempts to sell I am reminded of Shelley's poem:
And on the pedestal these words appear:
'My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!'
Nothing beside remains. Round the decay
Of that colossal wreck, boundless and bare
The lone and level sands stretch far away.