naruto - Why did the Uchiha Clan want to Rebel?

In Naruto,
the entire Uchiha Clan are all slaughtered by Sasuke's brother,
Itachi.

If they're so weak, why did they want to
rebel?

Also the third hokage doesn't seem to be the kind
condoning genocide. Does this make Konoha a socialist country?

Answer

1. Itachi is not an evil
   guy, he is a double agent. He does the killing for Konoha because the entire Uchiha clan
   was planning for a coup de'tat against the village and Itachi, who already have seen so
   much slaughter in the ninja war, does not want more blood spilled, so he kills everyone
   in the clan including his parents. The third Hokage was against the policy from the
   start and the killing took place without his permission. It was headed by Konoha elders,
   Danzo and ANBU under him.




2. Why didn't
   he kill Sasuke? Because he loved his brother and he couldn't kill him. He wants Sasuke
   to be an Avenger so he can become powerful and, because of his hatred for his brother,
   Sasuke can surpass Itachi. Finally Itachi plans their final battle so that by the time
   he dies he transfers his eye techniques. Yes, Sasuke gets the Mangekyo after that
   showdown and Yes, Itachi dies at the end of the
   battle.




3. How does Sasuke know about
   this ? It's revealed to him by the Head of Akatsuki (Remember Itachi and Kisame were
   going after Naruto) which is a terrorist organization for which Itachi was a part of. He
   joined the group to keep tabs on the organization and secretly keep his eyes on their
   plans with respect to the village. the reason he comes to the village when he fights
   Sasuke is because he wanted to threaten Danzo to prove to him that he is alive so he
   doesn't cause any concern to
   Sasuke.

Konoha is one
among the major five Countries and throughout the series the crux of the matter is being
a Ninja is about making sacrifices and how much one pushes themselves for the sake of
the mission and their Village. Itachi loved Konoha. To him the village meant something
more than his clan, except his brother.

I hope I have
clarified your question. if you require further clarification. Add a comment. I will try
to explain furthermore.