Meanings of dark underside in English

It revealed the dark underside of the Western spirit.

What was it like to tear apart a place that you love and show that dark underside?

However, Verne gives his hero's brilliance and benevolence a dark underside-theman's obsessive hate for his old enemy.

If you didn't know the lore, you would liken the dark underside to unwholesomeness and the light underbelly to goodness.

I hadn't always been this way, but after a year fighting the Fomor and the dark underside of Chicago's supernatural scene, I was somebody else.

As the silver-tipped explosion neared the high wispy clouds, the roaring missile brush-stroked brilliant shades of red and yellow instantaneously across their dark undersides.