I think there's a bit of symbolism regarding the real world in what happens at the end of the manga. Katsuhiro Otomo is known (and admits) to have been strongly influenced by american movies and comics before making Akira - even his drawing style is a lot more westernized than mast manga out there now or back then: the proportions are much more realistic and this even holds true compared to other more mature mangas like Evangelion, which still present a more stylized, traditional drawing of the characters.
In that sense, I think Otomo did a great job of taking what he loved about the american pop culture - namely the high-octane action pumping at all times and the daredevil characters - and also to a certain extent the anti-establishment sentiment in favor of individuals, while japanese culture is A LOT more community-oriented than the american. In this sense, the ending with Kaneda accepting the food but sending everyone else away so they can rule themselves is sort of like the author saying, in some level: "thank you for all the inspiration but don't come here expecting us to become a slave to your culture; we'll take what we like and we don't need you to oversee or help us with anything, we can do it our own way, just as well as you do". This is especially relevant considering he had just ended his masterpiece and, frankly, it kicks ass. No american comic back then (and even now, I think) can compare to the genius of his work.
I may be reading too much into it but I think my theory explains why it is there and why it closes the story even when it seems so out of place, as most people commenting here seem to agree. It's more of a message to the audience - both japanese and american, making it painfully obvious that this work of art is japanase at heart and proud of it! It doesn't just take the ideas Otomo liked from american culture and creates a manga based on it - no, it takes a few of those ideas and creates an entire new thing based on japanese culture - and becomes a cornerstone for all new manga.
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