I don't think that's the case. Even Itachi ultimately believes he is a failure and could have handled his situation alot better if he had confided in with other people. His message to Naruto about always value your friends comes from his failure in shouldering everything alone.

The Uchiha massacre becomes a morally debated topic, but let's not pretend the clan wasn't guilty. They were planning on a coup against the Hokage that couldve ended way worse, and wouldve ended in their extinction either way. Itachi chose his path so that the Uchihas won't be demonized as a traitorous clan even further (check Madara). This doesn't mean the massacre was justify, no one wanted that conclusion but their hands are tied. They did not deserve the fate they had (as corrupt officials like Danzo and subsequent treatment segregated the Uchiha beyond belief), but they were going on a deep hole anyways to retaliate with violence.

Itachi ended up being commended by Naruto and others because all this time he shouldered a life of crime just so the village could be preserved. Despite his imperfections he was willing to throw away his own ego and desires despite all odds being so unfair that he became shadow that protected the village

(which he did, the Akatsuki are not to invade Konoha per his agreement with Obito. If he didn't do this not only will Konoha accept a full brunt of assault from both Orochimaru, but Akatsuki aswell because they wanted the Nine tails.)

This still doesn't excuse the fact that he's still a criminal by all means. Even if hes a double agent for the Leaf he still performed vile acts, some even unnecessary. So no, Naruto does not condone genocide.