I think you're still stuck with the problem of literalism.
Let us suppose that someone said, "John has accomplished a lot as president," with the intention of telling the people of the glorious actions of their leader. That may literally be true. If someone said, "John is the bomb," with the intention of telling the people of the glorious action of their leader, that may metaphorically be true.
The question of figures doesn't disappear because passages intend to invite praise.
The same is true of any passage meant for easy memorability.
Poe's Law.
Poe's law, named after its author Nathan Poe, is an Internet adage reflecting the idea that without a clear indication of the author's intent, it is difficult or impossible to tell the difference between an expression of sincere extremism and a parody of extremism.
http://en.wikipedia.org/wiki/Poe's_law









