E.g., Ayn Rand's insipid atheistic objectivism pap, and modern atheistic libertarianism that believes that a people who reject God and the moderating influences of traditional virtue-instilling institutions including church and family can remain free, prosperous, and secure.
But Edmund Burke described well the deadly consequences of such morality-negating hedonism and populism when he critiqued the sorry state of France post-revolution.
Libertarians--particularly atheist libertarians--are drunk on the same rotgut populist, knee-jerk anti-government wine that the Jacobins brewed up in 1793. This drunkness led to the Reign of Terror which ultimately created the necessary conditions for Napoleon to wrest absolute despostic control of France.
What was it Santayana said about those who fail to learn from history?