I get in trouble when I refer to the Incarnation as the ultimate metaphor daring to yoke the human and the divine. To a literalist, I have just said that the Incarnation isn't real. As a poet, I think I have said that it is reality. So metaphor to me actually has a holy purpose. God made our minds to think metaphorically so that we would be able to live holy lives, to really accept the Incarnation of Jesus Christ.
Most sensible people are afraid of metaphor.
Politically correct people have the same problem with metaphor as fundamentaliststhe literalizing of images. Metaphor is always based in nature. It's very concrete. So if you're going to say we can't talk about dark and light, you might as well just never notice what it's doing outside. You'd have to live in your mind and not in the natural world.