Sasuke would make a horrible leader. He doesn't care about Konoha. You really think Sasuke cares about anything but his own vision of Hokage? Let me ask you this, why kill Tsunade? Tsunade is a respectable Konoha shinobi and has devoted her life to Konoha since becoming Hokage. You really think Konoha will accept Sasuke for killing Tsunade. Why kill Gaara? Gaara is allies with Konoha and by killing him, Sasuke simple sets Konoha back and makes them look like backstabbers. Sasuke only cares about his own goals and nobody else who's not a Uchiha. Naruto cares for the village and everyone in it and would do anything to protect it. That's the difference between Naruto and Sasuke. Sasuke can be the best leader in the world but if he doesn't have the trust of Konoha he'll never be Hokage. And Sasuke doesn't know anything about being Hokage. There's doing what needs to be done and then there's stupid choices, and Sasuke's doing the latter. Nothing can defend his appalling actions now.
But he does care about Konoha. He cares about Konoha because Itachi cared about Konoha and Sasuke has taken it upon himself to take over Itachi's duties and protect Konoha like he wanted. He states this during the meeting with the Edo Hokages. It's the whole reason he got involved in the war, and literally risked his life multiple times trying to save everyone. And given that Sasuke was shown to basically idolize Itachi, there's really no reason to believe that he's not as dedicated as he appears to Itachi's dream.
We don't know why exactly he is going after the Kages, though it's probably because they are responsible for keeping the flawed system the way it is and would oppose any change in said system. As for Konoha accepting him and setting the villages back, huh? How would anyone else know what he did? Everyone except Team Seven is currently in the dream world, meaning that they won't have any idea what he did before he awakes them. The only complication would be Kakashi and Sakura, and a genjutsu solves that problem.
Again, Sasuke has literally gotten involved in a major conflict and risked his own life to protect not just the village, but the entire world. Those are not the actions of someone who doesn't care. And really, Naruto would do anything to protect the village? He refused to stay in the village where it was safe and instead ran around where he could have been grabbed, he disobey Jiraiya's orders and nearly killed Sakura, he lied to Karui and continued to reinforce the claim that Sasuke was a Konoha ninja despite the fact that it could have led to war and then threw it all on Ee to prevent said war, refused to obey the Alliance's protection, and continually allows dangerous ninjas to go free. Just because the narrative goes in his favor doesn't change that Naruto only does things that benefits what he wants, and rejects any other way. The current situation is partly due to the fact that Naruto refuses to put the safety of others over his own desire. At least Sasuke has shown the habit of actually listening to other people and accepting their opinions.
Sasuke knows exactly what it means to be Hokage and protect the village. Have you forgotten that the whole reason he had the Edo Hokages revived were to asked about those very things. It was the talk with them that caused him to abandon his desire for revenge and work to protect the village. I would say his actions are extreme, but as mentioned before, at least he has an idea of how to fix the world and changed the flawed system.
And you ask how he treated Sakura like crap? Well let's see, he badmouthed her on how useless she is in the Kaguya fight, told her how annoying she was and placed her in a Genjutsu and told Naruto he cares nothing about her. Now if Sasuke is going to treat Sakura, a character who has been loyal to Sasuke through the best of time and the worst of times, like this, why on earth would anyone think he would treat the rest of Konoha any better? Why would you want that as your Hokage? A person who's going to tear you down instead of encouraging you?
And yet he went out of his way to save her life at least three times: against the Juubi-spawn, from being caught in the dream world, and from being caught in the Chibaku Tensei. His comments about her being less important compared to him and Naruto in the Kaguya fight was harsh but completely true. They couldn't worry about her safety at the expense of their own, cause if one of them died, then it was game over, the whole world was doomed. Even Kakashi agreed with him. He has always considered her annoying, since the very beginning. I'm not sure why he's a bad guy for getting annoyed at a person who keeps going on about her feeling for him despite him making it clear again and again he doesn't love her. Heck, us readers have complained about her constant talk of love of him despite there being no basis for it. It makes prefect sense he would be annoyed with such a person, just like how Sakura got annoyed at Naruto and Lee for doing the exact same thing to her. Are you saying he's under some obligation to return feeling he doesn't hold? Despite considering her annoying since the beginning of the series, he has still saved her multiple times, including during the recent situation. And I already explained the genjutsu, which was done to keep her from getting involved, which considering the last time she got involved she nearly got killed, seems more like a plus then a minus.
Exactly what about the current situation granted him any reason to "encourage"? More importantly, you do realize that's how cadets in the military are trained, right? I don't recall any other Hokage being "encouraging" , nor Naruto ever being that way. I do recall Naruto calling Konohamaru out on his crap attitude, but I suppose that's something else. And I also recall how the children under the previous Hokages were trained not to give in to emotions, and ninjas who did were criticized and even pushed to suicide. Seems like you're faulting Sasuke for lacking something that wasn't there in the first place.
I'm not sure how Sasuke's plans can be justified anyway; is him planning to murder the Gokage, the Bijuu, Naruto, and likely becoming a dictator Hokage a good thing? Thank God Naruto is there to stop him. :x
True about the Gokages at this point, but the Bijuus have been shown too dangerous to be left around. Even if they themselves don't go evil again (and given how easily they went that way before...) that doesn't prevent them from once again being used, since all the villages have the knowledge to capture them. As long as they exist, they can once again be used as weapons. Naruto's a target because he has the Bijuu's chakra inside him and we have been shown that even a little bit is capable of being just as dangerous.
Well, considering that the Kages are basically military dictatorships since they have complete control over the military and really don't have to answer to anyone else, I guess you can say that Sasuke wants to be a dictator. But then that's true for everyone who wants that position.