He basically did it to make sasuke hate him so sasuke would become stronger and obtain the mangekyou so that he could take sasukes eyes to obtain a permanant and more powerful mangekyou sharingan
Fugaku Uchiha was the father of Sasuke Uchiha and Itachi Uchiha. He strongly believed that Itachi was the clan's future, and did all in his power to help achieve this goal. As a result he often neglected Sasuke. Itachi often forced Fugaku to spend time with his youngest son, though even then his mind was always focused on Itachi. His wife, however, stated that Fugaku often spoke of Sasuke when they were alone. Once Itachi began to distance himself from the clan, he and Fugaku had a falling out. As a result, Fugaku began to spend more time with Sasuke, coming to consider him the pride of the clan. After training Sasuke in the Uchiha clan's more basic jutsu, he instructed his youngest son not to follow in Itachi's footsteps. Fugaku was later killed by Itachi.
Last edited by Chiefblackhammer; Feb 12, 2008 at 06:41 AM. Reason: Double Post
Based off of recent manga revelations he killed his clan WITH the help of Madara Uchiha to do nothing more than “test his limits” which he told Sasuke when he left him alive that day. He gained the Mangekyo Sharingan by killing his best friend, Shisui Uchiha per instruction of Madara and he left Sasuke alive so that Sasuke would gain the Mangekyo Sharingan by killing naruto. Itachi did this so he could steal Sasuke’s eyes giving Itachi an “Eternal Mangekyo Sharingan” Currently Sasuke and Itachi are battling for this right now in the manga.
So there you have it, the whole “reason”.
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Itachi needed to prove hes skills, he wanted to know how tough he really is.
He didn't kill he's parents(..yet) just because he wanted Sasuke to see him killing them, to anger him, to have Sasuke hating him.
No, their parents didn't really favor Sasuke, rather Itachi. But as Sasuke was groving up they had high hopes for him. But Parents approval and acknowledge was everything to Sasuke, especially he's dads. They were important to Sasuke, not the opposite.
Why he left Sasuke alive? To get he's eyes in the future, to obtain the "unlimited" Mangekyo Sharingan. The one that will never blind you and have even greater power becasue of your own Mangekyo Sharingan and the sibling ones, also to obtain that it needs to be siblings eyes.
Btw, somewhere I read that Madara influenced Itachi to do so.
And those who don't undersatnd yet and read everything they belive, Madara ain't Tobi a.k.a. Obito.
Tobi is yes indeed Obito, but not Madara. Unless madara has shifted bodies. After Obito has grown up.
Madara aint Tobi(Obito) because he couldn't.
Madara fight with the 1st.
Obito learned under 4th, rater long period no?
Why was Obito such a duch and sucked then?
Why did he gave he's eye to kakashi?
And how the fk he could have been? He grew up in konoha!
In a way, it would make sense tho, Kakasi is using Mangekyo Sharingan vs Deidara to destroy hes arm with the worm hole.
How the heck would kakashi have it, kill hes best friend? No, they were Obitos(Madaras) old eyes. I think he didn't use it before because as a non-uchia he didnt' know who. I bet he learned in that time.
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Obito only had the Sharingan before he died and thus anything further than that Kakashi developed on his own.
The "yet" reffered to Itachi...
He waited untill Sasuke arrived the room so Itachi could kill them under he's eyes. Ofcourse they are dead