The Invention of Lying/Fridge

Fridge Brilliance: Since no lying means no imagination, most of the consumer products in the film are boring and unimaginative. The computers, monitors/televisions, stereo equipment... even the office decor. Humanity invented these things out of necessity, without any flair. It's more subtle than the advertisements in the film, which are more prominent in their mundaneness, but it goes along the same concept.

Fridge Logic that's been asked to death but let's ask it again here: In a world where everyone is brutally honest all the time, why hasn't the human race wiped itself out?