There doesn't need to be evidence! It's basic human nature! People do things that are in their best interest!
You said earlier that you wanted to change your name. You really should consider doing that because it doesn't suit you at all right now. This is not a hard thing to analyze. Let's break it down simply:
We have 5 nations: Konoha, Kiri, Suna, Kumo, and Iwa, right? These are the 5 major powers, they're currently in an alliance giving them even more impact on each other's decisions. Let's give Konoha to Sasuke like they would always go in his favor, even though a lot of people there probably hate Sasuke too.
The war is over. It is well known that Sasuke committed crimes, killed samurai, whatever else, and destroyed the Raikage's arm. The nations are aware of this and hold a hearing. The question of the hearing is what should be done about Sasuke. If the conclusion is come to that he should be killed, then he will be killed. If he is not killed after that decision is come to, then the other nations are going to be very upset and either sanction Konoha, making it so they have difficulty getting food, goods, weapons, jutsus, workers, or whatever the hell else, or outright declaring war and killing people in Fire Country and Konoha. This would be bad for Konoha and they want to avoid it so they would not go against what was decided in the hearing. If you're thinking of saying "I don't know that they would have a hearing or that it would be structured that way!" which would be really annoying, know that something like an alliance would be impossible without the ability to have this. And an alliance is unenforcable if no one can exert any pressure on anyone in the alliance.
What should be done about Sasuke?
Konoha: Let him go
Suna: Kill him (Probably, maybe Naruto could get Gaara to do something, but I doubt it. The backlash would be HORRIBLE for Gaara among his own people and he never seemed to like Sasuke at all.)
Iwa: Kill him
Kumo: Kill him
Kiri: Kill him
Are Sasuke's crimes deserving of being punished by death? Yes. He destroyed the arm of the leader of a country. That's attempted murder in addition to crippling someone who is vitally important to an entire nation. That's in addition to all the other kitten he did. Everyone would come to this conclusion if it was anyone other than Sasuke.
Why do the four nations say kill him? Because he committed crimes, he is dangerous, he is powerful so he can kill THEIR ninjas if he is freed, if there is a war he will fight against them, they have no way of knowing they can trust he won't go crazy again, etc, etc, etc. etc. Sasuke is aligned with Konoha, not with them. They have nothing at all to gain and everything to lose by him remaining alive. Therefore they will want him to die, therefore they will vote to kill him. They're ninjas. Death is part of their job description. There is no reason they would be sympathetic towards Sasuke or squeamish about killing him. So what happens? Sasuke is killed.
The only thing that could prevent this is Naruto busting in at the last second on his hands and knees and they feel sorry for him. Then Sasuke simply has his chakra sealed and is imprisoned for life. This is all extremely common sense stuff. You're saying we don't know what they would do, but the ninjas in the story are presented as human beings, right? Not aliens? They will do what is in their best interest. And this greed and self-interest shown by the powerful people was displayed in the story. Most notably with Neji's father, where Konoha cowed to the demands because it was easier to kill Neji's father than deal with what they would lose in fighting with Kumo.
Edited by DrK, 28 October 2017 - 12:15 PM.