I'm pretty sure they show Itachi sitting on top of a telephone pole watching Sasuke come home first, obviously waiting for him to show up.
EDIT: Yes. http://www.mangahere.com/manga/naruto/v25/c224/16.html
Still, having the village blame Itachi leaves Sasuke room for doubt, and possible paths besides mindless revenge.
Confronting him and telling him you totally did it and also that the reason you did it is because you're super evil and the only way you can make it right is to become evil too is...again...the stupidest fucking plan ever.