Premature release because of your connections doesn't sound like being held responsible. Yes, Sasuke helped them, but it was because the enemy was in the way to his own likely totalitarian plans (after all what was his plan to make everyone hate him so much that they'd ignore all other conflicts. They want to reward what amounted to the Stalin version of the alliance. Fine, but the series shouldn't pretend that it something other than what it is. He didn't help them because it was the right thing to do.
Probably the worst part of the series is how poorly concepts like accountability were handled. This kind of issue along with general ideas about justice can often be at odds with redemption. Naruto gets past the natural conflict largely by ignoring its existence.
Kishimoto really shot himself in the foot in order to keep Sasuke as an antagonist for the final battle.
Not counting the crimes against his home country Sasuke has: assaulted and kidnapped a high ranking member of a foreign countries military, attacked a summit of world leaders, join a terrorist organization bent on taking over the world... actually ending the world by turning everyone into plant food, and tried to taking over the world himself (granted Team 7 clearly covered that one up.)
It says something that Sakura who "never doubted Sasuke for a second because of her deep unending unquestioning love for him." Thought it was absolutely absurd along with everyone else (except hinata, because she wasn't involved in the classmates reunion during the war) that he would try to become hokage after all he had done.
As for Sasuke's side of things, "why should he remain loyal or feel the need to atone to a village that committed democide on his clan?"