Because they are the ultimate symbol of Utopic Dreams that have been hijacked by the Reality Borg, forcing you to confront the Paradox of Choicelessness.
Think about it: without Lumbars, your soul's interior would be a dull, uninspired place.
Here's a neon Lumbars to help you see the light.
Or, you know, just go for something more subdued like a flat Lumbars.