Board Thread:Naruto Discussions/@comment-31338621-20200326215538/@comment-43599250-20200328043247

Itachi hated Danzo, Shisui unlocked it by letting his friend die out of jealousy, idk about Kagami, he's a filler character (although the wiki doesn't state that he had the MS)

I guess Itachi grew up with the same psychosis, peace can only be achieved through strong power. That's why despite being a pacifist, he trained hard. He saw the higher-ups of the Hidden Leaf as hypocrites, we should all know how he sees Danzo, and he saw Hiruzen as weak. He kept close to few people, choosing his friends carefully. When the higher ups asked him to kill his entire family, he had a difficult choice to make. Ultimately, he decided that he was a Leaf shinobi first, and it would prevent war. He went through with it. He just couldn't kill Sasuke. He joined the Akatsuki to watch over the Hidden Leaf Village and Sasuke. He told Sasuke lies about who he was and what he was doing to encourage him to become strong enough to kill him. Maybe he saw it as payback to Sasuke for all the pain he's caused him, idk. That's the way I see it anyway.

TL;DR Itachi hates Danzo, Shisui was jealous, Kagami is filler, Itachi is the most thoughful and selfless character in the series.