Give up all you want dude.
Doesn't change the fact that Sasuke has killed too many people to simply be forgiven by anybody other than Naruto. There are too many reasons why Naruto's words alone can't be enough. He can end the curse of hatred sure,he could even make Sasuke turn to the good or non evil side. But Sasuke is not going to be able to come back IMO and making it so he can would be utter Balls.
To quote another member.
Sasuke is wanted by both the ninja and samurai so he is and international criminal who attempted to kill sakura and kakashi , Killed the Hokage elect Danzo attempted to capture and ultimately kill the lightning country's 8 tails host who is also the brother of there raikage . Killed Samurai Invaded a meeting between the 5 kages and the head samurai which was held in the samurai land in neutral territory attacked the 5 kages and there subordinates and killed some samurai. Sasuke cant come back if he does he will just be ultimately left to rot in a cell or killed for his actions against the land .
You must be registered for see links
You must be registered for see links
You must be registered for see links
You must be registered for see links
You must be registered for see links
You must be registered for see links
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.
You must be registered for see links
You must be registered for see links
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.
You must be registered for see links
You must be registered for see links
You must be registered for see links
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.