Re: Sharingan's effect on Uchiha
Theres no evidence yet that one who uses too much sharingan will be possibly go insane. As for Itachi killing his clan, DarkAztek & MikeyM1979
explains it. The pictures you post doesnt prove anything on Insanity of a Naruto character. As of now, theres only three sharingan users we know and for me, non of them is insane.