not a valid excuse, he may have been manipulated by itachi,orochimaru and tobi, but in the end he was the one who made the choices he did.
Interrupted important Summit pertaining to him and Akatsuki, killed a Kage, took on the other Kages (all on his own free will) and even killed a god damn helpless Zetsu!
you know what they say, any thing you do under 18 is not used agaisnt you. You can go to ninja court and get it off your record. Sasuke still has 2 good years to kill.
He is a criminal.
killing itachi he was not a criminal then he may of even got praise from the leaf from taking out some of akatsuki all was good here.
But:
Deciding not to follow his brother wishes and deciding to crush the leaf
Attacking the hidden cloud village to capture killer bee
Killing samurai and causes the raikage to lose his left hand
Makes him a criminal