not worthy to be called a masterpiece

Rating: 8/10 (2 January 2017)

I saw this film yesterday, and I'll be honest I cried like a little b*h (I'm 20 something guy) while watching it and tears rolled up my eyes even when I saw just the stills from this film. No doubt, this is very sad and touching film about war and it really made me think about for some time. But the longer I thought about it, more flaws started coming up.
First of all, the story. I don't mind that's it is really plain, it did what it had to do: it made me care. But for the problems and the conflicts in main characters lives are quite solvable. The aunt did get mad at them, and there was valid reason for it. The boy could go find a job and help her aunt out, but he didn't. Maybe he didn't want to leave his sister and that's why he didn't get a job, but later in the film, he constantly leaves her in their new "home".
Then there's issue with famine and malnutrition.Their mom left some money, so I don't really understand why they didn't spend it on food. Maybe the brother wanted to save money for something else, but when you and your sister are dying of hunger right now, there are no valid reason not to spend it on food now. Basically the problems of main characters could be solved, if brother had swallowed his pride, went back to aunt, apologized, found a job and they would have lived happily ever after.
Secondly, the montage that pulls the heart strings and makes most people cry: when we see the little sister on the swing, eating mud and playing around their home. Well, there is no other reason for that montage to be there, than to manipulate with audience's feelings. Why are we seeing this? Are these memories? Whose memories? From whose point of view are we seeing this? Neither brother or his soul is there to see it. And the scene where Setsuko is saluting with a pot on her head - that scene is made purely to play with our emotions and to feature on posters.
BTW, the creator of this film said, that it's not anti-war movie. It's original purpose was to show Japanese teenagers at the time (1988), what their parents went through and to teach children not to be so self-entitled little brats.
In conclusion: Grave of the Fireflies has beautiful animation, beautiful score, strong message but it lacks in character depth(lack of story arc) its story has logic flaws and it is purposefully designed to make us sad.
Grave of the Fireflies is a great animated film, but I don't think it can be called masterpiece