- The Engineer
you're saying that the point in the narrative isn't to excuse Itachi, it's to offer context and an 'ideology and trauma' theme that is common in Japanese storytelling
The *vast* majority of the Naruto cast is dealing with some form of "ideology and trauma". Even the "good guys". The difference is how they go about dealing with that and how much how they deal with ends up destroying or helping the people around them. The "good guys" are the people who manage to deal with their mental issues without dragging everyone else around them down with them. Oftentimes with the mentality of "I'm not going to let/make you go through the hell I did". The "bad guys" are the people who deal with their mental issues by making life worse for everyone around them. Usually because they think "my life sucked, so that means i can make *your* life suck".
That people are traumatized *at all* is always considered a tragic thing. Who was traumatized doesn't really matter. But what they do with that trauma... that's varies a lot. Itachi... got put through some of the *worst* trauma in the story... and he puts someone else through some of the worst trauma in the story. He also does it to make *damn sure* no one will ever be traumatized like he was again. Itatchi is a sacrifice to his own ideals in the end, not someone else's.