The Perks of Being a Wallflower
What is the significance of the little boy being lost and returned by the “older kid?”
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Charlie sees a little boy lost in a mall. He is helped by a tough looking boy who is rather offensive to mother when he sees her. I suppose Charlie didn't think an older boy like that would go out of his way to help a small child. I think there is the underlying idea that this tough boy might have been abandoned himself as a child.