Sasuke never went through what Itachi did. It's a moot point trying to judge what Sasuke might have done using his current personality as a point of comparison.

One thing to remember is that if a genocide was an acceptable tool for the Konoha leaders regarding the Uchiha situation, they also accepted the possibility any other clan of Konoha might face the same fate. Live by the sword, die by the sword. So, from Konoha's point of view Sasuke's decision is not unreasonable.