because i think that itachi knew that he is going o killed by sasuke,that sasuke is going to awkened his MS, and sasuke is not going to follow him,not to harm the konoha village,cause itachi killed all of the uchiha clans member cause madara said to him and the elders of konoha and the 3rd knew it and let him so madara wont bother them again,itachi transplant the same tech that madara used when he let sasuke see his sharingan and then the MS of itachi figured to sasukes eyes and Amataresu tech was used on madara,as i said itachi that tech to ''surpass' the power of amataresu and so naruto to kill sasuke in result sasuke wont harm konoha..if u dont understand what i sid let me explain it better