Sadism

Sadism is a philosophy based on Marquis de Sade. Sade was an atheist, and believed that ethics and morals are nothing but a lie made by ruling classes to fool the ruled classes, which would allow the ruling classes to dominate all the pleasures themselves. Sade also believed that the ONLY thing that is worth following is pleasure.

It's also worth noting that Sade self-proclaimed to be a democrat during French Revolution and had opposed the Reign of Terror.