Itachi kills the clan cuz the uchiha clan was planning to go against konoha and they were trying to use itachi as there spy THIS IS THE f**** TRUTH
to test his abilities
The Konoha Council and Danzo were the ones who told Itachi to kill the Uchiha clan.
yes, itachi killed all of his clan except sasuke and himself Actually Madara uchiha help itachi kill is whole clan except sasuke and himself. OneManga.com Read mangas they are more accurate then the show.
because shisui was spying on itachi for the uchiha clan because the uchiha clan new that itachi was working with the leaf to try to overthrow the uchiha clan plus to get the mongekyou sharingan (you must kill your closest friend to obtain the mongekyou sharingan)
no itachi was ordered by the hokage to kill the uchiha clan but he could not kill his little brother but he beg the hokage to let sasuke live liar itachi would feel guilty of wiping out a whole clan
itachi killed his clan becasue it was an order from the konoha council. (third hokage, and the village elders) they thought the uchiha clan was planning a plot to destory Konoha and with fugaku, itachi and sasuke's father, being the leader of the clan's police force, he used itachi as a double agent, or coup-de-ot.
Itachi seeked out madara to help kill his clansmen. this was an agreement so madara wouldn't attack the village if he help itachi kill the clan. itachi did kill uchiha shinsui and gained MS. it is proven and it has no evidence proving otherise. shinsui was the best uchiha next to itachi. the clan knew itachi to be a prodigy but did not know the extent of his power. this can be noted when 3 police officer came to question him about shinsui death and he took them out in 2 or 3 seconds. this is full 3 tome sharingan users. itachi abilities was unrivaled because he killed the best of his clan without a scratch. there was no visible wounds on him the next day. which leads us to believe he is extremely powerful. this was then confirmed by the elder to pick itachi out of all his clan members to carry out the massacar. he was the only one talented and skilled enough to do it. madara couldt kill the entire clan by himself and neither could itachi but together they could. remember this is the uchiha clan. the most formidable and known as a battle clan even a genius was just ordinary before them.
Itachi was ordered by the Hokage to kill his entire clan because he thought the Uchiha clan was a major threat to him. But only Itachi, the Anbu captain that was also involved in some way, and the Hokage knew that. Itachi was going to kill the entire clan, but couldn't bring himself to kill Sasuke as well, because he had a strong bond with him. So Itachi told Sasuke to hate him and to feed off of it, so he could get stronger. Itachi also told Sasuke that if he wanted to get the Mangekyou Sharingan he must kill his best friend. So Itachi ran away, and it is said he cried as he ran. Itachi joined the Akatsuki and waited for the day that Sasuke would come and kill him. Madara later tells Sasuke, after he kills Itachi, that Itachi planned to give him his eyes.
maybe i think Tobi will
To take revenge on him for making Itachi kill his own clan.
Yes. If fact he's so obsessed that he wants to avenge Itachi and kill Konoha because they forced him to kill the Uchiha Clan.