Itachi threatened danzo to sell out konoha's secrets if he ever touched sasuke, I dont see people crying over it
Considering Danzo wants what is best for Konoha (Or at least, what he thinks is best) I'm pretty sure threatening to tell all of Konoha's secrets was the only way to actually ensure Danzo's agreement.
And as for why Itachi would threaten that in the first place, just remember Konoha had him exterminate his own clan. I'm pretty sure Itachi, why still seeing himself as a loyal Konoha shinobi, wasn't really too concerned with it literally right after the massacre.
Then again, you could look at it in that Itachi only sees himself as a loyal Leaf shinobi because he had already given up his clan for the leaf, and trying to say he's anything other than a leaf shinobi would kinda make the Uchiha massacre pointless, at least to him.
And Hinata? Whatever, she has big boobs. That only Naruto gets to touch....