How is Sasuke stealing power from Sasuke? Itachi wanted him to have this power and that is why despite being in his death bed he kept himself alive with medication so as to die by Sasuke's hand. Sasuke did not really kill Itachi. Itachi was a dead man walking. One way or the other, Sasuke would have awakened his MS. Kakashi did.
Naruto is also going to use someone elses power and he often uses the nine tails foxes power so what is the difference? If you want them to have a fair fight, then Naruto should only use his own power.
Regarding Uchiha name being proud, everyone calls them the cursed clan even Tsunade. It is very hard to be something else when you are already labelled by birth as cursed and an avenger.
Sasuke deserves to be angry. What the clan elders ordered his brother to do was wrong. You are supposed to wipe out the bad guys not an entire clan. There must have been children and good women in the clan and they were innocent. What did they do to deserve murder? After getting to know Danzo, it seems he was after power and had he stayed alive Naruto would have been in danger. It was wrong for Itachi, a very intelligent guy to let himself be manipulated by a guy who was hungry for power just because he was a pacifist.
Itachi also made Sasuke who he is. Abuse rarely creates good people. Itachi should have used another method to make Sasuke make the Uchiha clan a clan to be respected. The moment he revealed himself to Sasuke as the murderer and started to torture Sasuke convincing him to hate people and even to kill Naruto, he made the Sasuke we see now.
On another note, it is still Sasuke who has made Naruto courageous enough to work on controlling the nine tails which would help him in the future when he faces the real bad guys.