I don't think it's where they are made as much as where they originated from..... I'm out on a limb here but I think it is safe to assume that the development didn't begin as a thought that came to someones mind while in a tree stand, a duck blind, or at a target range.
For someone to pretend that they just can't understand why some people see assault type rifles in a different classification than sporting guns is pretty lame.
Everyone, especially the folks that own or want to own them, know darn well why.