Not all of his actions are right, but apparently his actions are worse than Madara's and Obito's. That's laughable.Question: How was Sasuke's actions right?
Currently he is trying to better the world and not repeat the same thing. In the past he sought revenge but that is over now, hence the past.
If I want to seek revenge for whoever I hold dear to me then I don't see how that's a bad thing.