[spoiler]Itachi was a hippie! A total war-hater. Seeing the third ninja war at the age of four did that to him.
When he found out that the Uchiha were planning a coup, he became a double agent, after he was a spy for the Leaf, his father made him join ANBU to be a spy against the leaf. Itachi was faced with a mission in the end, to kill his entire family. He was forced to go through with it.
After finding Madara and asking for his assistance, they would destroy the clan, leaving only Sasuke, because Itachi couldn't kill his own brother.
Itachi would plead with the third to make sure he didn't tell Sasuke of his clan's evil past. Itachi himself telling Sasuke to run and cling to life, to hate and detest him so that Sasuke would one day come back and kill Itachi.
[/spoiler]
I'm too tired to write anymore right now.


