*sigh* Sasuke hasn't even done anything yet & people already want him to die. We all need to come to an understanding about something. Sasuke's primary goal are the beasts & in all honesty, if you forgot that Sasuke even knew Naruto, you wouldn't look at him as the bad guy per say. The only one that loses because of the beasts destruction is Naruto... And Bee I guess. The beasts have always been used as a source for warfare and Kurama has proven this. If not for the beasts, Naruto would still have a family. Also, do you remember what the Akatsuki Clan were going to used the beasts for? War, money and extortion. Sasuke realizes that in order to eliminate the bigger threat, the smaller threat must first be eliminated.
Sasuke's sadness of last chapter, showed that he genuinely does care, but for the sake of the world, choices need to be made....sacrifices. Sasuke isn't giving a crap about be a ruler. He just wants to end the universal threat to society. Being Hokage just makes sure that it stays in place. I'm no Sasuke fan boy either, for I'm no fan boy of any character to be honest. I just understand the logic behind his decision & like it or not, he isn't wrong.
At least he isn't trying to keep people in a universal and eternal lie like Madara. Now, that's twisted.