Yes it could be viewed as easy to say such things when you are beyond the grave, but he now knows of knowledge which he didn't posses before i.e. Sasuke going ultra emo. Also, should the buck just stop with him and not go to the leadership commanding him? Just because he was an elite ninja in terms of battle prowess and analytical ability does not necessarily mean he was exposed to the required intellectual or philosophical discussion which would fully develop his sense of right and wrong. His role models in this regards were either the Uchiha clan, who ready to commit on the surface an act of treason, or the village leadership who were ordering a massacre.

Should a young man, no doubt immensely talented, have been promoted so quickly through the ranks of ninja and be exploited as an elite soldier for his battle capabilities without having had the chance to train his mind as well? Its all good talking about the will of fire but that's just some patriotic crap that doesn't deal with moral dilemmas such as the one Itachi faced.