I feel like our focus on the 20th century really limits our understanding of the depths of human depravity.
This is an image of two Assyrian soldiers forcing a captured Babylonian to grind the bones of his family.
And you might say "Wow, that's a really mean thing to say about the Assyrians!" No, this is them bragging about doing it in immortal stone form.
This wasn't printed out on a laser printer, it wasn't etched using a laser engraver. It probably took weeks or months to lovingly create this work. They were really proud of their depravity and wanted to share it with the world.