Originally posted by: originalkrn
Because if someone else killed his clan for the sharingan and Itachi was only trying to protect them, Sasuke will go after that someone else and that somone else will most likely kill him. This will allow Itachi to have some sort of protection over Sasuke because if Sasuke seeks Itachi, he will either:1. Be stronger than Itachi and Itachi won't have to worry about the someone else killing Sasuke for the sharingan or 2. Be weaker than Itachi - and Itachi will not kill him, but instead motivate Sasuke to become stronger. And if Itachi didn't tell the entire town that he killed the clan, then Sasuke will obviously find out and go after the "real killer".