Or more aptly titled, "Why breaking the cycle of hatred is a bad reason to make Sasuke Hokage."
I apologize if this thread has been done before (I know plenty of people are on either side of the 'Sasuke for Hokage' bandwagon) but I'm gonna summarize the argument from my point of view. It's always fun to read different perspectives, after all... Anyway.
To begin with, let's look at the cycle of hatred:
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So, this cycle was started because YoungerBro was chosen as the Rikudo Sage's successor instead of OlderBro. OlderBro was pissed, attacked the YoungerBro, continued being pissed, passed down his pissedness to his offspring, etc. etc.
The Uchiha's resentment was born out of believing themselves to have been brushed off and perhaps labeled inferior to the Senjus. Hence, the two clans fight and can't seem to get the hell over it.
Madara started out as a pretty okay dude...
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As everyone can see, the cycle has continued and is paralleled through Madara and now, it seems, Sasuke.
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And now he wants to be Hokage, too. Just like Madara did. And remember, Madara had good reasons for wanting to be Hokage originally, too.
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This is where the "Sasuke should be Hokage because this will end the cycle of hatred" argument comes into play.
If Sasuke is made Hokage, the initial cause of the curse of hatred will have been rectified and put to rest. However, when you say that the damage done by something needs to be "fixed" or "rectified," it's implied that someone did something wrong or made a bad decision in the first place. Is this the case?
If the older brother had been chosen by the Rikudo Sage instead of the younger brother, would he have attacked and started a curse of hatred? No, I don't think he would have. Should the Rikudo Sage have chosen the older brother so that he wouldn't have lashed out in anger in the first place? No.
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There was a reason he chose the younger over the older in the first place, and the elder brother's deficiencies are what caused him to revolt in the first place.
WHY IS THIS IMPORTANT?
Because if we are to believe that the only way to end the cycle of hatred is to allow Sasuke to become Hokage, this is implying that Sasuke will continue the cycle of hatred if he is not allowed to do so. This means that he will turn into another Madara and become consumed with hatred and continue to lash out at the village. Picking Sasuke on that basis would be the equivalent of having the Rikudo Sage pick the older brother over the younger.
Fear of potential repercussions is not a good reason for appointing someone into a position of power.
The curse of hatred should be broken before Sasuke is ever anywhere near the position of Hokage and should be ultimately unrelated to achieving that title.
But wait. There's more to this curse of hatred, isn't there?
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Oh, boy. So that elder brother a long time ago wasn't entirely responsible for his actions. Apparently, the "Sage's eyes" have some genetically inherited special chakra attached to them. This special chakra is directly related to experiencing loss and mucks up their brain chemistry and causes extreme emotional instability. Huh, that sucks.
Well, in that case...
Maybe Sasuke does need to become Hokage to break his own cycle of hatred. Maybe he's not capable of doing it otherwise, and maybe he really would simply become another Madara.
Except Itachi and Shisui were capable of breaking out of the cycle of hatred on their own through the mythical power of love.
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So even with the maladaptive Uchiha genetics, there's still no reason to placate Sasuke with the title of Hokage in some misguided attempt to break the cycle. If he is made Hokage simply in an effort to rectify past "mistakes" and to prevent Sasuke from going crazy with hatred, the only thing being accomplished is a complete circumvention of the actual problem.
How will we know if Sasuke has really broken the cycle of hatred? Unfortunately, if Sasuke is made Hokage, we probably won't know.
In order for Sasuke to create his own path and not follow in Madara's footsteps, the answer is not for him to become Hokage. Instead of getting what he wants, Sasuke needs to be passed up for the Hokage title and accept this without turning evil. This is how Sasuke will be able to show personal growth. If Naruto passes up the title, Naruto is showing personal growth, not Sasuke.
But for the sake of argument, let's say that Sasuke gets to be Hokage and doesn't turn evil. That means the cycle of hatred is broken for good, right?
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Well, no, not really. Since this condition is genetic, there's no guarantee that another Uchiha down the line won't completely lose it after experiencing a great amount of loss. With this kind of condition, another 'curse of hatred' is highly likely to be started again eventually. It's a cycle of cycles.
There is no way to permanently break the Uchiha's "cycle of hatred" as it pertains to their special chakra. Any Uchiha who experiences loss will have to battle this descent into darkness, and let's be honest, their track record isn't looking too good.
I don't know if Itachi knew about the genetic part of the 'curse,' but he understood the overall effect and it likely factored into his decision to wipe out his clan.
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Controversial much? Well, considering we haven't cut off the reproductive abilities of mentally ill people yet (yay eugenics!), I'd say the morality of Itachi's decision is up for debate.
END.
IN CONCLUSION, IN CASE YOU STILL AREN'T TOTALLY CONVINCED THAT MAYBE LORD SASUKE SHOULDN'T BE HOKAGE... IN THE WORDS OF MY FRIEND:
XX: Sasuke's not a very good leader, imo.
XX: He recruits those three dudes
XX: And then fights every battle for himself
XX: And ditches the three when it's clear they're gonna get pwned