He helped release Edo Tensei, and brought four of the strongest shinobi ever to the alliances side, plus he and Orochimaru will help. He will save their asses, so if they will likely forgive him, (not that Sasuke is the type to care about that stuff anyway) and if they don't, what are they gonna do? They don't exactly have the power to take him down or anything, and it's not like Naruto is gonna help them. Plus, Hashirama will just say, "naw man Sasuke my nigga he cool." After that I doubt they are even willing to even say something bad about him. Not with Hashi singing him praises.