[[ Because people have this awful mindset that Itachi was “too mature” and therefore he’s solely responsible for his own actions as if other people aren’t capable of manipulating him or using his fears against him. For Christ’s sake, he’s the same age as when Sasuke left Konoha. He was a kid. A kid with vulnerabilities, and with too much pressure on him and a superior who was deadset on getting the Uchiha killed, no matter what.
Obito helped him, they had a deal, he’d let Obito help, as long as he didn’t harm Sasuke. So that was one more person who really wanted to get in on it, and not hurting Sasuke was just the one rule. Itachi even admits in manga he alone couldn’t have fought off the entire Uchiha clan.
If Itachi had said no, if he sided with his clan, they would’ve died anyways. Danzo wanted them dead no matter what, a fact the person arguing with me just likes to ignore. Itachi was convenient and useful, he wasn’t some monster who was gung-ho on the idea of killing them. He avoided it as long as he could, he refused at first. The thought that the fighting might spill out and involve other countries and the loss of Shisui is what finally got him to cave and agree to the order. Itachi is fully aware what he did is heinous, and wrong, and was a betrayal. The only deaths he felt were justified were Yashiro, Tekka, and Inabi, because they were also aggressive to him, and if anyone was an example of aggressive and unhelpful Uchiha pride, it was those three. He cried when killing his parents.
Put the blame on Danzo and Hiruzen, where it belongs. Not on Itachi. ]]