I think you are conflating "hatred" with the "cycle of hatred"
No, I'm not. Hatred itself is the critical element through which this professed "cycle of hatred" is born from. The CoH itself refers to hatred's existence in the minds of people and how it has perpetuated itself throughout history.
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As you say, hatred will never be removed, and there will always be reasons to fight, kill, or do evil.
So you are in agreement then. I only wish that Kishi would acknowledge this fact and attempt to address various other concerns that should realistically be looked upon when discussing the concept of what amounts to a chimerical society devoid of conflict and misunderstanding.
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The "cycle of hatred" is the system that breeds and develops the worst in people, instead of the best.
It's one particular method for forging abhorrent individuals. Personally I would say that someone like Hidan is exceedingly worst than the likes of Pain or Tobi. At least for the latter two they have motivations that they perceive as beneficial to not just themselves, but everyone as well. For Hidan he's literally a sadist who takes great pleasure in the suffering that he brings upon others as he preys to his malevolent deity to help maintain his immortality. He has no ethical qualms with this crimes and there is altruistic intention with what he does.
You refer to a character, not born from hatred or any system that fosters ill will like the one being propounded in the manga, that could be denigrated as evil and I would refer to Hidan as evil (quite literally in fact). With hatred you can at least comprehend that those who abide by an "unconventional" approach at life did so with some element of tragedy that you are able to understand and possibly even sympathize with. As horrible as Pain or Tobi's actions were I would place my life in their hands before I did someone like Hidan who oftentimes tried to kill his own comrade IIRC.
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It puts Danzo in power, because people are afraid and want to feel that his despicable actions will protect them.
Danzo's organization and actions symbolizes what could be perceived as a "necessary evil". Because despite the infantile ambitions of Naruto and his friends there will always exist that situation where actions which may go beyond what their morality would entail may be necessary. My perception of Danzo is that he's a flawed militaristic extremist believing that his ideology is best. Now is he accurate when it comes to applying those beliefs in a political system? No, at least not in its entirety. I do feel that taking any ideological extremity, including the one which Naruto had to have his companions disillusion him from (in reference to his belief that he was capable of preventing any deaths from occurring), is incorrect.
What would probably amount to as the "best" system to utilize will likely be a combination of the Younger and Older Son's teachings. This includes Danzo's willingness to use military effort in the event that something goes awry. Don't get me wrong, his approach is still heavily flawed. I just believe that there are some elements from his perspective that would logically be applicable in a system that is endeavouring to prevent conflict or carnage. We saw examples of this with Hashirama choosing to put the safety of the village above his "friendship" with Madara and Jiraiya appropriately designating Orochimaru as a dangerous missing nin that needs to be silenced to prevent future bloodshed (which ironically occurred back in P1; the circumstances of which involving Suna did not even pertain to any "cycle of hatred", I believe it was referenced that they were merely disgruntled with Konoha's authority which would be classified under the intention of power seeking).
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It makes Gaara's father turn Gaara into a monster, rather than a defender of the village.
I can't really dispute this. His father's approach to instilling Gaara with the necessary capabilities for protecting Suna did somewhat backfire on him although given how jinchuurikis in general were disparaged and alienated from society I think he would still experience some emotional tribulations even if his father decided to assume a more direct and affectionate method for training Gaara. It just wouldn't be as severe as it became in the manga.
You could attribute Gaara's suffering to Chiyo as well since she was the one who burdened Gaara with the status of jinchuuriki in the first place. Gaara's father merely gave the instruction to do so. In some ways Chiyo is even more responsible for Gaara's suffering than his father.
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It is the idea that it is okay if civilians are hurt as long as the enemy is defeated, without thinking about how many more enemies will be created in the future by harming civilians
Yes, but you also have to factor in the emotional, mental, and intellectual factors behind each individual's response to a situation. Properly educating the populace with the reasoning as to why so-and-so happened and attempting to reach out to them with emotional support would likely yield, at the very least, some benefit in averting anyone from becoming like Pain or Tobi again. Because as we see with the likes of Gaara it is possible to alter the mindsets of those afflicted with some form of suffering.
Not that this approach would prevent all possible criminals from being born but my presumption is that it would significantly reduce the amount of them that exist currently.
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So I don't think that hatred is being treated as an all encompassing universal cause.
But you didn't really address my points about there existing other motivating factors behind someone choosing to become "evil"; neither has Kishi really. But if you want to please refer me to the segment of the manga where he makes an effort to directly address the issue of these other motivating factors.
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Actually would be awesome if he could share the rinnegan's powers with his clones
Forgive me for saying this but your sentiments in that regard are irrelevant considering that Kishimoto has made it a point to establish Naruto as a character who doesn't require KG or any special abilities to become a powerful shinobi. Granted that point has been contradicted somewhat with the most powerful bijuu's chakra sealed within him being available to use at any time as well and recently with the realization that he is a descendant of a prestigious clan who specializes in advanced sealing techniques and possess a naturally large amount of chakra.
I would like to see Sakura's superhuman capabilities become incredibly more powerful, including her speed, whilst providing her with some additional skills like advanced genjutsu abilities, some elemental ninjutsu, Slug Sage Mode, and possibly the ability to unlock the inner gates to compliment her taijutsu skills but you don't see me attempting to affirm that opinion as being probable. I realize the unlikelihood of Sakura even receiving any additional power ups, as much as I hate to say that.
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and we also never see how the sage mode would fit in with the rinnegan(which probably the former sage of the six paths could have been used to),
I'll grant you that SM, considering the enhancements to all of a character's stats that it provides, would greatly compliment the applications of Rinnegan. However, no insinuations were made to suggest that the Sot6P knew how to use SM. If this statement is incorrect then please provide the chapter and page number pertaining to the reference of the Sot6P being able to use SM.
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which would be insteresting more than Kyuubi mode with sage mode because since both have similar powers.
They have different enhancements, different extrasensory capabilities, and different aesthetics. Not to mention there's the possibility of fusing with Ma and Pa now who offer their own repertoire of techniques. Regardless of what you or I think though we were provided with a blatant display of Naruto using both modes in conjunction back during the Invasion of Pain arc. There's more evidence to reinforce the prospect of Naruto combining the modes together than him receiving a discrepant powerup which he cannot even obtain without first extracting the Sharingan from someone else and then implanting it into himself. That's an action that we would never see from someone like Naruto.
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But the cycle of hatred is like a cancer, metasizing more ill for the rest of their society.
And that is what Naruto/Jiraiya wanted to correct.
Yes, it is a very significant predicament. That wasn't my point. I was referencing the fact that there exists other motivations for people altering their mindsets to where they become iniquitous aside from them hating one another or seeking to apply their brand of "justice" on others for a past wrong that was committed either in war (Chiyo's initial attack against Kakashi) or during a "treacherous" act committed by someone else or an organization (Sasuke attempting to avenge his clan).