Cynic: A blackguard whose faulty vision sees things as they are, not as they ought to be. –The Devil's Dictionary Ambrose Bierce

How does Bierce's definition of a cynic relate to naturalism?

Naturalism focuses on corrupt and immoral characters such as blackguards.
Naturalism is based on the belief that people are inherently evil.
Naturalism reveals things as they are, rather than as one would prefer to see them.
Naturalism reveals things as they should be, even if that vision is perceived as faulty.