no… he isn’t mad at him. surprised, yes. fascinated, too. because the little boy is so selfless and wants to do only good things for those around him. itachi is left with the hope that it doesn’t do nagato any bad in return: he doesn’t deserve this, either. should not let another child’s unhappy face dull his own light, let it take away reasons to smile in return.
and, being honest, with feelings and intentions for others, good or bad, wasn’t it more of a bad thing? for shinobi especially! why mind if people are happy? why ruin yourself to make them happy? —
would it make me happy, too, to see others smile? even though i cannot? even though i struggle? am i deserving so much happiness while i do not care for others?
his head hurts. he’s too young. for thoughts like this, for problems like those. for topics that would recquire much more experience than little boy itachi has on hand: but he can try.
„there are so many reasons why people aren’t happy… why they don’t smile like you want to see them smile. maybe, something sad happened. they… lost someone. they failed at exams or… didn’t do good in their training. so many reasons you can’t change! and it would hurt more to try fight against all of it and… you can’t make everyone happy just like this…“
Nagato’s fidgeting, waiting for an answer, feet dangling over the side of the dam. Part of him thinks it’s wrong to want such a grand thing, people will always be sad about something right?... And soon enough Itachi tells him that too - the boy seems to be mentally beating himself over it too. But he’s not sure why it’s so important to him...
Nagato may be wrong - Itachi says so too, but is it wrong to wish to take some of the great pains of the world away, like war and famine. No, that can’t be wrong.
He turns to the Uchiha with the most determined expression he had: “I didn’t mean the usual sort of sadness, Itachi! People will always die, people will always lose something, people will always fail an exam, but why do people have to die young in a war that’s not theirs... I mean I want people to smile because there’s no war, there’s no death everywhere, there’s no prejudice. There will always be strife I guess. And sadness too. But it doesn’t have to come from so many dying too soon...”
And he remembered his parents, in a pool of blood, on the floor, motionless, skin so pale it looked like snow. He brought his legs to his chest. He realized they were trembling.
“I want to rid the world of war not sadness... But even that would make people smile more than they do, right?“ Nagato didn’t get if he got hurt: what else did he have to lose but himself.