Peanuts. Don't sugar coat it; it's rather clear that Tobirama only sees the uchiha as a threat and enemy [
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] and made the same mistake the elder son of the sage also made, thinking that power was the key to peace [
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] [
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] but just ended up starting a chain reaction of war and violence. Tobirama is clearly biased and would go as low as to accept rumor as fact [
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] "
The more they are full of hatred, the more their eyes are powerful". Itachi proved him wrong. He's in the spotlight and doesn't want to take the blame, making petty excuses. Madara knew Hashirama would fail to deal with him as he is too
soft lacks dignity [
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] and allows tobirama to have his way.
I'll have to give you the run down of the entire history. After Madara loses his brother for the sake of war against the Senju his hatred towards the Senju would've entered phase #1 as noted
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, hence why they remained conflicting clans even after both Hashirama and Madara became Leaders and should have still shared the same ideals in terms of peace. Further implication of this is that,
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. Apparently, Madara's ideals changed after his brothers death which is no surprise based on the Love he had for his last remaining brother. Also Izuna was a younger sibling which would increase the the psychological impact being that Madara was basically his care taker. As we follow, we see that Even after the entire clan had decided to accept the truce for the sake of peace
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. Irrefutable evidence that his ideals had completely changed. At the point of accepting the truce as their leader it's clear that
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. Hashirama's election only seemed biased to Madara and we know that he decided to
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. It is at that point he realized that he was no longer their leader but Hashirama had taken the Role, which introduced Phase #2 of his hate...
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. As the hatred settled it became unbearable and he
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. It's only natural that if you lose the two things you valued most in your life that thoughts of revenge would stirup. Hashirama is to blame for letting tobirama having his way, i can't help but see why Madara has taken such actions yet, not killed either Hashirama or his younger, foolish brother.