I know what you are trying to say but Sasuke's case is different. The Senju & Uchiha were fighting one another for solid reasons and were leading clans in the world. Sasuke is not a strong leader or strong force,he is one man who is doing this on his own and for selfish reasons. Madara wanted to improve things for the Uchiha, as a clan. Sasuke just wants to kill everyone for revenge. You get my drift?You must be registered for see links
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The two strongest clans; Uchiha and Senju agreed on treaty and swallowed their prides essentially forgiving each other's sins and later recived an offer to stabilitze the land with the support of the Fire country. This was more or less the birth of Narutoverse's government, with that said these very same families / clans who were previously for hire mercenaries. Only after years of combat did they grew tired and basically decided to change for the better, all of course after killing how many people? Did the Senju and Uchiha, etc. have to pay for all of the murders they committed before making up to get to that point? No.
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Onoki the Tsuchikage himself states that shinobi are always involved in battle, fight solely for their own countries / villages and fail to empathize with others, concerned only with themselves.
Even through all of this he can remain on a positive note stating that everyone is building on top of their past mistakes, and gradually moving towards peace.
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As stated by Onoki this war is about protecting everyone and while sure it's only a hypothetical situation but what if Sasuke were to defend the alliance from Tobi and co? In doing so he could possibly begin a redemption phase to make amends for his crimes.
This war has already begun to positively effect the values the kages -- they are actually voicing out a chance at elimating the hatred inside the ninja world so ruling out the possibility of them being forgiving is simply being close-minded.
Senju & Uchiha were at war...no one claimed war on Sasuke,that was his undoing.