He said it does, YOU say it doesn't. Who deserves my faith more? The guy who was there throughout battle after battle with Uchiha? The guy that did experiments on the Uchiha?
I do, because I'm the omnipotent reader who knows more about the Uchiha clan than Tobirama does lol. I'm also not nearly as biased as he is. While he was dead, I was able to see the course of Uchiha and Ninja history. He wasn't.
Madara wanted peace too. His motivations had nothing to do with him going insane. Madara gave up his pursuit of vengeance thanks to Hashirama attempting to commit suicide for him. He regained it later when Konoha started being anti-Uchiha and Tobirama started telling everyone their secrets. Everything Madara has done has been in the pursuit of peace. Mugen Tsukuyomi as opposed to just killing everyone?
No, Black Zetsu motivating him to go to war and gain the power of the Six Paths is what lead for him to go insane, combined with the lose of his brother, his clanmates, and then his clans betrayal.
It absolutely does for several reasons:
1: You don't know how many of them had Sharingan or MS. MS was supposed to be rare in the first place. And Sharingan isn't guaranteed among Uchiha.
2: Tobirama And Obito both flat out told us that some of the Uchiha still supported Madara.
3: As Tobirama and I've said ad nauseum, not all Uchiha fall to the curse
1. Case and point, you don't know either, and Tobirama doesn't give any numbers of how many who did. We know of less than 10 Uchiha's who attained MS, with others who apparently tried to attain it. Regardless, trying to attain MS doesn't mean there is an actual curse, it means that the Uchiha clan was hungry for power. Hungry for power =/= to a curse.
2. Tobirama was also biased and all of Obito's knowledge of the Uchiha clan comes from Madara who not only lied to him but was biased himself. How did they support Madara if they all abandoned him and chose Hashirama? That doesn't make any sense.
What actually happened, or rather what we are told what happened, was the Uchiha clan began to change back to the way Madara thought via Tobirama's treatment of them. Orochimaru then commented that Tobirama essentially created a self-fulfilling prophecy out of his own prejudice which culminated in the planning of a coup by Fugaku and destruction of the clan.
Regardless, again, none of this has to do with an actual curse. The Uchiha were discriminated against and thus acted a certain way, a way that has nothing to do with the curse.
3. Then there is no curse. How can there be a curse if it picks and chooses who it wants to affect? The fact of the matter is the Uchiha are like all humans. Some fall into darkness, some don't.
In the case of the Uchiha clan (and many other characters in the manga) we have people succumbing to mental illness via scaring experiences and manipulation. The same exact fucking thing happened to Gaara, and he overcame it, just like Sasuke did and like Obito did. The Uchiha clan's curse is nothing more than a product of the ninja system.
Hell, Tobirama could be considered cursed as well. The massive amount of loss he suffered forced him to isolate an entire group of people and create a jutsu that raises the dead.
Lie isn't the word I'd use. I'd comfortably claim it's based on absolutely nothing though. It's just, you have to understand what it looks like when you argue against what's been shown in the manga, and the best argument you've got is "Nah, that's not true cause the manga contradicts it", and then the proof you mention is fucking non-existent.
And you can't say Tobirama only has proof of 3 Uchiha going crazy, because he said "I've seen it happen many times." HIS TESTIMONY IS MY PROOF. You don't have anything that can be likened to this. Word of mouth from the most knowlegable person on Uchiha relations outside of the actual Uchiha clan. The fact that I'd take his word over yours should be of no surprise. You've shown me no manga contradictions to what he claims. None. Not any. You haven't shown a lot of Uchiha who weren't affected by the curse. You haven't proven that Tobirama's experiments didn't prove what he claims they did. You didn't prove that his bias makes his claims inaccurate either.
So you are basing your entire argument on the words of one ninja, who mind you, has no evidence other than his own hearsay backing his own claims. Who is so biased he was ready to kill Sasuke without even hearing him out.
In the entire course of the manga a curse is never not once mentioned until Tobirama mentions it. In fact, his own brother, who has just as much experience as him, wasn't sure to believe him.
"I've seen in countless times"...he must have been the only one to see it, because Danzou, Sarturobi, Orochimaru, Madara, and Itachi never mention a curse among the Uchiha. I would think Itachi would have been able to justify his actions more if there was a curse yet he never mentions it. Danzou who hated the Uchiha clan never mentioned it. Sarturobi who was Tobirama's student never mentioned it. Orochimaru who was obsessed with the Uchiha clan never mentions it. They never mentioned it because it doesn't exist, it was an excuse Tobirama created to justify his own actions.
Black Zetsu's entire speech about manipulated people as far back Indra goes to show that the curse is a bunch of bullshit. Tobirama had no idea Black Zetsu even existed.
Black Zetsu was essentially the curse. He kept prodding the Uchiha clan, using them as pawns.