I wanted to do a "to be fair here, Cash had songs with stupid lyrics, too", but all I can think of is "Ring of fire" and that one is just a harmless metaphor about love.
I'd argue that Ring of Fire is a metaphor about forbidden love that you know is damning you but the feelings are too powerful to resist.
Rather than a harmless metaphor, I find it an incredibly powerful metaphor about the pain and suffering caused by helplessly loving the "wrong" person.
I don't think modern country even uses metaphors anymore. Before anyone comes at me, I'm well awair that there's some fantactic country writers out there.