I'm not scientist or anything, but I think Naruto destroying the moon would have some pretty negative effects on the narutoverse. I mean i know it's a manga...but the general rules of gravity should still apply...
The moon being gone would pretty much cause massive tidal waves would basically cause most of the earth to be covered in water?
I could see why he would need to destroy the moon to prevent Infinite Tsukuyomi (not sure if i spelled that right), but the results of that would be just as bad as everyone being caught in a worldwide genjutsu.
I know this is a manga..but damn..at least follow some of the basic rules of the real world lol